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Apparently after the final four you get to travel back to kanto where everything is seemingly as it was but the Saffari Zone is now a hub for players to meet up at random with other trainers from across the world, very similar to the Island in AC:NL
There is also in Cerulean city a statue of MIssingNo and a statue of a black and white Mew
Activities include racing your pokemon (she didn't say exactly how that worked) and 5 - 6 mini games from the pokemon stadium mini games that were on N64.
It also lets you take part in a 'Buddy system' where you can take one friend/stranger and travel throughout Kanto as a way to get decent XP for online battles