I do hope we get the typings and abilities of Rockruff's evolutions confirmed. I'd also like to see them animated.
That said, with only 3 months to go, where were we with the pre-release info in the XY cycle?
Going off Serebii and the pictures released:
In July 2013, they showed off Honedge, Pangoro, Spritzee, Swirlix, Spewpa, Inkay, Malamar, Gym Leaders Grant and Clemont, the photo spot at Parfum Palace, the PSS, Holocaster, GTS, O Powers, and Team Flare. (Apparently, CoroCoro said Team Flare's only purpose was to make money.) We had to go off a sketch for Trevenant because it was first shown in a movie. CoroCoro mentioned Skrelp and Clauncher's exclusivity. They revealed that Sycamore battles the player.
In August, they first revealed Mega Evolutions with Mega Blaziken, Lucario, Absol, Mawile, and Mega Mewtwo Y (but they didn't market it as "Y" at the time). They revealed Bunnelby, Dedenne, and Skiddo, Korrina, and we got our first glimpse at Super Training. There was an English demo of Route 3 with a ride-able Skiddo. The demo showed how Mega Evolution works (by just pressing the big button). Fairy-Type moves were shown to not be very effective against Fire-Types. Apparently one of the demos had a Shiny Sylveon.
In September, they revealed that players will also have a choice between the Kanto starters and they revealed Mega Venusaur, Mega Charizard Y, and Mega Blastoise. They revealed Pyroar, then the starter evolutions, Furfrou's different haircuts, Meowstic, Tyrunt, Tyrantrum, Amaura, Aurorus, Mega Mewtwo X, Mega Garchomp, Flabebe's forms, trainer customization, the Team Flare admins and Xerosic, and Diantha. They revealed Grass-types could no longer be seeded or affected by powder moves, Electric-Types could no longer be paralyzed, and Ghosts were no longer affected by moves that keep them from fleeing. At the end of the month, they revealed Doublade.
In October, they revealed Mega Charizard X, Slurpuff, and Aromatisse. Mega Aggron, Mega Gengar, Mega Tyranitar, and Mega Kangaskhan were shown in that month's CoroCoro. And of course the the game leaked.
It's actually a little surprising looking back we only knew of Megas 2 months before the game came out, whereas we've known about Z-moves for quite a while.
EDIT: Might want to note that before this, we only knew about Mega Mewtwo Y being an "awakened" form, the starters, Sylveon and the Fairy-Type, Pancham, Helioptile, Gogoat, we could ride Gogoat, Fletchling, the fact we had 3 separate Pokedexes, different looks for the trainer we could start with, Noivern, Vivillon, Pokemon Amie, Talonflame, Clauncher, Skrelp, horde battles, Scatterbug, Flabebe, some of the companions, and the first gym.