I think the Marill that stands next to the girl in one of the pics is kind of a hint/proof that we will be able to have one pokémon walking behind you ;o
EDIT: Yup, I used google translate for the page and it says your pokémon (every one) will be able to walk behind you. It kinda works like with pikachu in pokémon yellow.
And you can catch both lugia and ho-oh in each game. Eg in Heart Gold you catch ho-oh first and after the pokémon league you can catch lugia.
Also the new girl sprite is better than I expected. Good job Nintendo and Game Freak.
Also, new pokédex interface (I think):
Me liek. Very very very very much. I am so going to buy this the second it comes out.
Sorry if I said things that have been said, but I just went through the pages and wrote down what I thought you would want to know.