Serebii.net has posted a bunch of info on the upcoming games below is the revealed information.

There are 156 new Pokémon in Generation 5. 153 Pokémon are available in normal gameplay and further 3 event Pokémon (#647, #648 & #649) will be distributed through various other methods.

#633 through #635 are a Dark/Dragon-type evolution chain
#638 is a Steel/Fighting-type Legendary
#639 is a Rock/Fighting-type Legendary
#640 is a Grass/Fighting-type Legendary
#641 is a Pure Flying-type Legendary
#642 is an Electric/Flying-type Legendary
#643 is Reshiram
#644 is Zekrom
#645 is a Ground/Flying-type Legendary
#646 is a Dragon/Ice-type Legendary
#647 is a Water/Fighting-type Event Legendary
#648 is a Normal/Psychic-type Event Legendary
#649 is a Bug/Steel-type Event Legendary

In Hiun City, the boats will take you to various islands.

hey, guess what? here are some new pokemon names!! ( these are to be real!): Zuruggu, warubiru, and nageki! hope this helps!