Pokémon X and Pokémon Y

Or, maybe they mean see...? And not catch? That's the way I'm taking it - that we'll be able to catch 'em all.

I doubt they even mean that. They probably mean that all pokémon from previous games are accessible through the game if you have them to transfer over. There were some 170ish pokémon missing from black/white2.

And then there are the pokémon which you "can" get all of, but are limited by choice (e.g. you get to choose one of the 3 kanto starters).

At minimum, I seriously doubt all the legendary pokémon are catchable. There are what, 50 or so legendaries at this point? I can't imagine they will have included en ough events for all of them, and having that many legendary pokemon just running wild around the area would be ridiculous.