Bit disappointed in this reveal, but at the same time I figured Salamence would get a Mega Evolution (just not... that look...). Anyway, the rest of the info:
Serebii wrote:
Pokémon Omega Ruby & Alpha Sapphire - CoroCoro Reveals
The next batch of CoroCoro information has been posted to Japanese forums and this batch showcases more information about the upcoming game Pokémon Omega Ruby & Alpha Sapphire. This reveals Mega Altaria, who is Dragon/Fairy with Pixilate and Mega Lopunny who is Normal/Fighting with Scrappy. It now knows the move High Jump Kick.
It also confirms that with you change your Pikachu's cosplay for contests, it gets 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
Edit @ 06:56: Mega Salamence is also confirmed and has the ability Aerilate
Edit @ 07:07: Contests are detailed. With you meeting a Contest Idol called Lucia, who will give you special clothes for participating in Pokémon Contests. You also receive a shiny Beldum through an event, where it holds its Mega Stone