The Omskivar
chah, dude
I don't actually mind the concept of Mega Pokémon as far as I understand it right now. I mean, I presume it's a temporary power-up, like a form change, not like proper evolution, and the mega forms we're seeing so far (except Awakened Mewtwo) do a decent job of looking like their base Pokémon with some kind of temporary power-up applied. If it turns out to be a proper evolution kind of thing, where the Pokémon is permanently changed to the mega form, I'll be less happy.
This is pretty much how I feel about it. I also don't like the idea of Blaziken getting something that Swampert/Sceptile don't, and even further than that, the Hoenn starters getting something that the Kanto/Johto/Sinnoh/Unova/Kalos starters don't. But I also don't know if I like the idea of every fully-evolved Pokemon getting a Mega form.
on the plus side I'm mostly super excited by the designs for them, minus Lucario's, it looks messy to me. I also like the three new Pokemon, so that's good.
And now checking serebii's New Pokemon page and following the link to the MegaEvolution page, it pretty much states that they're temporary in-battle changes "different to evolutions and formes."