cannot resist urge to comment on CoroCoro leak: 
- The Kyurem formes got taller than the original Kyurem, Zekrom, and Reshiram, but not heavier. That is logic right there.
- Two years, I wonder what else could have happened other than what we already know, which is a lot
- They dried up the water around the Entralink. Drought in that area maybe? inner area changed as well, points to more major changes. Keldeo/Meloetta/Genesect via Entralink anyone?
- The ice is clearly fake, so GameFreak is being secretive :0
- North and East Unova is covered by ice. More development here? Has Opelucid been changed, since it has some ice on it? Changes for Kyurem/something else anyone?
- At least two new towns and at least one new route: obviously awesome new stuff, maybe new gym towns?
- they finished the road between Castelia and Nimbasa: might this mean we get to explore the east side of the desert now, with the construction stuff gone? 
- we have a new building in front of Nimbasa, maybe just a gateway but hopefully something better, maybe with binoculars and some trainers. who knows, maybe we'll even get a team's secret base in the form of a store or something. by that I mean like a mall, maybe slots, or even a new transportation system/way to the underwater tunnels
- new area to the east of the Ferris Wheel: Keldeo's cave maybe, just maybe? or a villain secret base, side quest area, or just new area to explore to meet someone important to the story/get an item
- with the Driftveil lighthouse gone, probably by the meteors or maybe by our new villain(s). maybe how Kyurem changes formes? 
- route 4 settlement, people to see, new areas to explore
- Liberty Garden revamp+shown on map - maybe we'll get Victini without an event this time. or maybe someone captured Victini. or maybe Victini is somewhere totally different, and they figure that there is no harm in putting it on the map
- Driftveil storage & construction gone: new areas to explore, new people to meet, maybe a way to sail somewhere. that might be stretching it a tad, but maybe to some islands or the battle frontier, hopefully (but likely not) Hoenn. on the battle frontier, maybe the subway could be the frontier as well
- missing part of a mountain on the east side of Unova, some buildings there, again, new place to explore, possibly location of Kyurem formes/Keldeo/random Meloetta or Genesect. maybe the location of the new move tutors? just a thought.
- Challenger's Cave disappeared: now underground, or still there but just not shown, or a chamber for a legendary, or new area
- webbing that initially blocks Chargestone Cave gone: obviously, they took it away before. but maybe the Joltik/Galvantula were captured or something
- 300 pokemon, or a total of 144 more: that's cool but the Pokedex #'s are interesting as well. Riolu at #33 and Psyduck at #28 probably means, based on previous editions of a regional Pokedex, that we will be able to get theses Pokemon early on. hopefully this means I can have Lucario on my in-game team and maybe Golduck, but I probably wouldn't use it. we also have Metagross at #264, which means it could be obtainable at any point in the game, so maybe we'll get that for the main story as well. Arcanine, Lapras, Mareep, Tyranitar, Buneary, Lucario, and Weavile as well, all cool in-game Pokemon if they make them so. Eevee included "might" mean we get new eeveelutions, Flying- or Dragon-type hopefully if so.
- male is underwhelming, but I like the female one
- new rival, childhood friend, the usual. maybe an actual cute back-story this time? "From now, I'm going to rage!" there has to be a reason for that
- chic with a guitar, Homika, Poison-type gym leader: Amoonguss Porii Sames? we also got her gym as a music club, if only pokemon was rated M. maybe some somewhat revealing chics though. cool stuff
- tanned dude with a bathing suit, Shizui: GF, you have fallen to even lower standard where a swimmer can be a Water-type gym leader. maybe he's like the lord of them or we'll get (please!!!) a swimming side-quest/main-quest portion. but he's big-hearted and a big brother, so maybe we'll get some decent stuff from is younger brother(s). multiple gym leaders/co-gym leaders possibly?
- new researcher named Akuroma: I heard a rumor that this was a Ghetsis with a diff. art style (the new eyes), and cut and died hair. probably not true, but still. he's researching Pokemon strength, doing something regarding the latent abilities of Pokemon, also mysterious and hard to read. have a gut feeling it's the new villain, either a remnant of Team Plasma, Ghetsis, or part of a new team. 
- Hiougi City new starting place in southwest, suggests the already-obvious development in the southwest. also the home of the new character, likely the rival too. it has a Pokemon Center and a Trainer's School, which suggests that there is more to do here. it's also a city, which suggests there is an absolute TON to do here. we also have a lookout, which we might need to spot something, or maybe just like binoculars in previous games
- we got an arena somewhere, some cool possibilities. the underwater tunnel suggests travel to new locations/yay use of Dive and maybe, just maybe to Hoenn. Mantine in the tunnel suggests it will be in the regional Pokedex. pokemon film studio filming an action series, maybe we'll get to be on film as sidequest or even (please) part of the main quest. 
- Absol and Pelipper, I like Absol and Pelipper will be my HM slave (maybe)
- regular trainers have animations, a cool touch
- water gym (probs Shizui's) has a lily pad puzzle, which should be fun
- 48 page manga book, probably some back story to one of the "new" or event Pokemon
- New Pokemon Scoop, which could be anything but hopefully will be a new Pokemon, but likely will just be Kyurem formes/Meloetta/Keldeo/Genesect
This is old news, but I actually like that the Kyurem formes stay Dragon-Ice. It doesn't ruin the flavor of either forme, and without Stealth Rock in play it's really good typing. Hopefully, GF will do these formes justice and we'll see a rise in Rapid Spinners to accommodate them. 
- I see that Homika has a gym that is kind of evil looking, referring to to the Poison-type. I also see what looks like a hovering/flying NPC. the possibilities of flying, maybe for the player character. fun. 
- Shizui on a beach that houses a mysterious cave: maybe a legendary Pokemon chamber or a new area likely
- beach hut, dock, standing on water, we'll be surfing/sailing somewhere
- player's city looks like it would be expansive, and the player has a random garden, nice touch. another beige building 
- trainer school, with pokemon center and different building. even more suggesting that the starting city will be expansive
- mountains & trees on Hiougi lookout, proves we are starting in the southwest, but one other thing. a crater!!!!!!!!!!!! new area to explore, Kyurem's chamber, or even better!!!
- unusual building along Battle Frontier-style buildings. please, please, please. yes!!!!
- modern, shiny tiles, huge marketplace. cool stuff, maybe we'll even get it in the starting town
I didn't notice the wires in the tail before, and the overdrive with the tails, but this might mean what has been said here about Overdrive a new ability, negating the recharge turn possibly, a possibility.
That is the crap ton I have to say, so cheers!
EDIT: 
@Tytus: That would be cool for a DW ability tutor, but other possibilities include a move tutor, changing Kyurem's formes, and getting Genesect's Drives.