So of course the new pokemon will be stealing the spotlight, but I'm sure a few people are happy that Gen VI seems to be offering up older Gen pokes in the region as well as new ones - unlike BW.
Which older Pokemon are you hoping appear?The Karos Pokédex will be separated into three areas: Central Karos Pokédex, Coastal Karos Pokédex and Mountain Karos Pokédex
Central Karos Pokédex has at least 77 Pokémon in it
Coastal Karos Pokédex has at least 51 Pokémon in it
Mountain Karos Pokédex has at least 6 Pokémon in it
Here's a list of those shown in the trailer aswell as their evolutionary relatives (though this list is not confirmed, and as such I wouldn't take them as confirmed until we get more details on XY):
How large do you think the regional dex will be? This is including both old and new pokemon--there's a separate thread for how many new pokemon you want here. Do you think the safe 150? 200? Maybe even 300 like B2W2?