What do I look forward to in BW2?

I just finished BW1, I'm surprised how much I ended up liking it. Best bunch of gym leaders imo. I originally didn't like the idea of limiting only to the Unova pokemon pre-national dex or beating the game, but I didn't mind it as the game went by.

A lot of folks have said that BW2 is good. What's different this time other than having older gen pokemon in the wild right from the start?