A magazine issue in Japan called CoroCoro has just revealed that Mega Altaria, Mega Lopunny, and Mega Salamence have all been confirmed for Pokemon Alpha Saplhire and Omega Ruby.

Mega Altaria was revealed to be Dragon/Fairy and given the ability Pixelite. Mega Lopunny was revealed to be Normal/Fighting and given the ability Scrappy. Mega Salamence is to remain Dragon/Flying and it was given the ability Aerilite.

The magazine also announced that there will be an event distributing a Shiny Beldum holding it's Mega Stone through an event upon the games' release.