expect lots of new tiles, including a meteor rock crash event occuring in dragon town, some new ice tiles, and new tiles for darkness creek, and TWO different extended storylines after pokemon headquaters
And yes there will be new legendearies in the game. The two legendaries in pokemon black and white will be the main purpose of the storyline after the headquarters, well one of them anyways, both them, a new rival, and the "creators forest" will be introduced