The official Pokémon site for Korea has accidentally leaked two new Mega Pokémon for Pokémon Omega Ruby and Pokémon Alpha Sapphire.
The two new Mega Pokémon are Mega Slowbro and Mega Audino. Very little is known about the two currently, but we do know that Mega Audino is a Normal and Fairy type with the Healer ability. As far as Mega Slowbro goes we know is that the Pokémon now has the ability Shell Armor and keeps its Water and Psychic typing. Mega Audino gets a boost in Defence and Sp. Defence, while Mega Slowbor has a boost in Defence and Sp. Attack.
It's unclear when the Pokémon will be officially revealed considering they weren't in this month's CoroCoro and that the official site has gone off-line in order to remove the two, but no doubt they'll turn up soon.