MegaMalamar...wow.
I mean, that guy looks amazing as is; though Contrary may either make it useless or as powerful as DW Blaziken itself. Only time will tell on that, but my personal reasoning against Gen 6 MegaEvos are explained below.
...Actually, I doubt there will even be a single Gen 6 Mega Evolution until the next game in line arrives (XY2, Z version, etc.)
So far, Game Freak is advertising MegaEvos as if its The Renaissance of Pokemon from gens long past (I assume there will be some Unova Megas, though--COME ON MEGA-RESHIRAM), and so far it's doing a fantastic job of doing just that.
To me, It'd just lose its innovative spark if we see Kalos Megas so early in the Gen's inception. Part of the thrill of Megas is that it attempts to revolutionize, or at least break, the evolution limit of old favorites--even if the way Megas work only proves that halfway. The prospect of Mega-Talonflame or Mega-Orotto wouldn't give as much of a "WOW Factor" as Mega-Blissey, Mega-Scizor or Mega-Regigigas would (Arceus knows the latter pokemon needs one badly--even if it only changes its Ability); and GF seems to be taking advantage of that.
...Still, Mega-Noivern sounds pretty nice right now.