Pokémon Omega Ruby and Pokémon Alpha Sapphire announced

There are quite a few big differences though.

Groudon: The spikes are bigger and a different colour, there are markings on its torso, the symbol on its arms are completely different, the pattern on the tail is completely different.
Kyogre: Different colours all over, the red is almost completely gone and replaced by blue, the big white blob above its eye is translucent and now has a line extending from it, the 4 wavy fins at the back now have a line on each, there is an entire pattern on its head that wasn't there before.

The changes are too big for just a power up. and both pokemon have been shown powering up in the games and anime before, and they never took on changes like they do here.

A lot of people are saying that there is not enough big changes for it to be a mega, but Kyogre and Groudon were already very detailed as they were. What do people expect? wings? an extra tail? What more could they add to these pokemon?

I would be satisfied with these designs being the mega designs but they just don't feel like mega evolutions for some reason to me :l
If that makes sense.