Despite the fact I really don't like Mega Evolutions if you ask me, but I don't mind about the next Pokemon game will be either Z or X2 or Y2.
However, my main concern is this, will there be a Pokemon Ruby/Sapphire Remake someday. I kinda like Hoenn games more than Kalos & Unova games, but I do like the idea of an another region being either in Z or X2 or Y2 because then the game will be very more challenging to accomplish than being easy.
Doesn't matter what will GameFreak will make next, I just hoped it ain't will also be more Mega Evolutions in the future because it ruins the idea for new evolutions or pre-evolutions to previous Pokemon from back then that I expect for them to evolve someday or whenever.