I have to say that i'm most excited about megalopunny. There's quite a bit to say about it.
I was ecstatic when I realized that normal/fighting with scrappy allows her to have perfect coverage with two moveslots, which in turn would allow her to continue her role as an excellent disabler until she needs to smash some heads. That sort of utility is the sort of thing I crave in a mon (the fact that I hatched a nearly perfect, shiny, jolly one way back in diamond helps just a bit).
Unfortunately, most of that utility comes from klutz/switcheroo, which isn't an option if you plan on megavolving. She's fast, so thunder wave is also fairly useless. On top of that, she doesn't learn close combat, or even hi-jump kick; the best she has for a fighting stab is drain punch or regular old jump kick (which isn't really that bad).
She still learns encore and magic coat, which could make her a semi-decent anti-lead until its time to break skulls.
I'd say she could be successful with all-out offense for her megalution, something along the lines of jump kick/power-up punch/return/ice punch, but this feels outclassed.
It's dumb that she doesn't learn u-turn or taunt.
I guess charm with cute charm could really mess up physical attackers, but there is way too much RNG going on there and relying on hax is dumb. If that strat worked, it would have been done the last two gens.
This is going to require alot of testing, which is something i'm pretty psyched for. I've always liked lopunny for some reason.
As for the other two, megasala just looks too stupid. Non-functioning wings make it impossible to stand, and yet it has legs, the back set of which strangely don't get tucked in like the first set. Dumb dumb dumb. Altaria on the other hand looks great and is great, but there's not much question what to do with it.
Hey, I'm lovein your excitement. If you're bored then it might be worth your while to go back 20 or so pages and sift through posts to see what else has been said 'cause a lot on M-Loppuny has been discussed. But I'll fill you in on some speculations and predictions be made based on what we know. For starters the translations from the corocoro scans have all but confirmed High Jump Kick
WILL be in Loppuny's movepool come ORAS. which is really exciting because as you've said Return and High Jump Kick will be powerful STAB moves with perfect neutral coverage on the whole game.
Loppuny is base 105 speed but only base 76 attack and M-Loppuny is going to have "A large atk increase and a spd increase" most people are ball parking this to be around +50 atk and +20 spd. Likely this means Loppuny will be in a very very favorable speed tier and have enough power to at least compliment it's new STAB and attack coverage (the higher BP STABS help make up a little for what will likely be a good but not great atk stat by OU standards)
As you said Klutz/Switcheroo sets are pointless for a mega. Mega Loppuny is basically the death of that set as Loppuny will likely jump up 2 or so tiers in usage now and that set was barely viable in NU (so like no one will be using Loppuny unless it's mega basically) Cute Charm is just a balls ability that is pretty bad on everything cause it requires you to get hit to sometimes activate and then randomly mess with the enemy maybe. So Limber is deff gonna be the ability of choice since it lets Loppuny switch into thunder waves before it mega evolves. (not a whole lot of utility but it's more than Klutz or Cute Charm provide)
For now a kind of "expected" to be good set for M-Loppuny looks like this:
Loppuny (f) @ Loppunite
Limbre/Srappy
Jolly
252 atk/252 spd/ 4 def
Fake Out/ *Support Move*
*Support Move*/ Elemental Punch
Return/ Facade
High Jump Kick
(I'm not building that like a normal write up with OO so don't harass me too much on slashes guys, lol)
Fake Out flinches everything including ghosts so it gives you a free turn to mega evolve on things that are faster than you. That's not totally necessary since 105 is already a decent speed but it also just gives nice STAB chimp damage to everything when Loppy switches in throughout the battle (and aids with revenge killing, beating weakened priority users, etc.)
Return > Facade in most situations but it's nice to not have to worry about burns. High Jump Kick is the most powerful attack but a little risky, still you can spam it way easier and laugh at ghosts who die to it now.
The elemental punches aren't required by a long shot but you can always grab them for extra SE coverage on random things you might not like dealing with on your team.
And then you can fill in *support move* with one (or two) of many options. The most interesting of which are likely Heal Bell, Healing Wish, Magic Coat and Encore. (which can make M-Loppuny do extra things like anti-lead or cleric or who knows)
This set is not going to be sweeping. M-Loppuny's main role is going to be acting like a "cleaner" and revenge killer as well as a check to some things. Sort of like a physical version of M-Manectric that replaces the utility of intimidates and switch priority with better coverage and whatever support option your picking.
Alternatively a full on offensive Power-Up Punch "sweeper" set like you listed could be viable too. I wouldn't only expect it to be if M-Loppuny is OU though (which a lot of people expect it won't be anyways, and a Pokemon with 125ish speed, +1 130ish atk and unresisted STAB coverage can definitely pull off some sweeping in tiers below OU that aren't half as plagued with priority and A-list walls.)
I actually think that's the full summary of what people (or at least I) are expecting for Mega Loppuny. (maybe no need to go back those 20 pages after all. Unless your curious about speculation on the other megas, I actually think it's a little not obvious what to do with Alteria, depending on how it's extra stats pan out it could be a dragon dancer or a support/wall, and likely it will have viable sets for both option)
Idk if it's come up yet but I was looking at the CoroCoro scans in depth and on the Feebas/Milotic page
What is that? Is that part of a page we've already seen or... Mega Milotic lol? (because I really want to think it's Mega Milotic due to colorscheme/subtle differences in face+head)
I think we're pretty confident at this point that Mega Milotic wasn't reveled in this Corocoro. That page was just about contest related stuff and Feebas's "return" to it's old evolution mechanic. The image you've posted looks like a blurry shot of the crease between two pages where some Japanese text is meeting up with half of a non mega Loppuny.
