CoroCoro information for this month has revealed some more information about the upcoming Omega Ruby and Alpha Sapphire games.
The big reveal is that Metagross will be getting a mega evolution. Steven uses the Mega Brooch to mega evolve his Metagross.
The information also references the fact that there are different Pokemon in Hoenn than when we last visited the region.
More information will be posted if and when it comes out.