I have to admit: I spend most of my game-time trading away my Pokemon via the GTS/GTS Negotiations - It's certainly one of my favourite parts of the game. Saying that, it'll obviously [well, hopefully] be included in Black 2/White 2, and improvements could possibly be made: the 'Level 9 and under' Reshiram/Zekrom spam has become a problem that needs to be sorted, and I'd personally like to see more smilies/emotions included in the Negotiations trades.
Do you use the GTS/Negotiations often?
Do you think they'll be improved in Black 2/White 2?
What features/improvements would you like to see?