Mega Swampert: Keeps it's typing and gains swift swim
Mega Sceptile: Becomes Grass/Dragon type, and gets the ability Lightningrod.
Mega Diance: No other info is known (might not even be ORAS, but we don't know yet)
Mega Groudon: It's called the primordial/prehistoric Groudon, and it is considered a "devolution"
Mega Kyogre: All details similar to Groudon, but with Kyogre respectively.
We also got confirmation of the return of Steven, and his role was confirmed to be what was commonly speculated. He is interested in mega evolution, and is trying to know more about the subject. It seems he has a Charizard-X, but it seems odd, due to the leaked Zard being level 100.
Team Aqua and Magma are returning, with Archie and Maxie leading each respectively. Their admins are redesigned, and the teams look a lot more polished, and they are different from their RSE version.
The CoroCoro shows that you will start as May or Brendan, but no other info is known. Will skin color be an option again? And can you still customize?
The CoroCoro also gave us our first look at the game's graphics, and they are quite similar to x and y, with just what seems to be a different color pallete. I.e. The grass is a little lighter, and the trees are different colors.
Also, it was revealed that the Mach and Acro Bike will be returning.
Are you guys excited that we finally got info? Feel free to speculate and converse in the comments!
Source: Serebii.net