New Info for Pokemon ORAS has come from CoroCoro. First up, three new Mega Evolution's have shown up, Mega Altaria, who is Dragon/Fairy with Pixilate, Mega Lopunny who is Normal/Fighting with Scrappy, and Mega Salamence who remains Dragon/Flying and has the ability Aerilate.
They have also confirmed that the costumes for Pikachu are indeed used for Contests as previously thought, and depending on the costume, your Pikachu will have access to special moves. Pikachu Rock Star gets the move Meteor Mash, Pikachu Ph. D. knows Electric Terrain, Pikachu Pop Star knows Draining Kiss, Pikachu Belle knows Icicle Crash and Pikachu Libre knows Flying Press.
d last but not least a special event has been announced for the launch of ORAS, a shiny Beldum will be given out through an event, and will be holding its Mega Stone. It's currently unconfirmed how the Beldum will be given out, or if it will be available outside of Japan.