Although there is some info on the other thread, I thought it would be nice to have one designated for 2010 sets.
According to some reliable members on Eurobricks, there will be three impulses! One will have a red and white jester, another has a wizard, and the final is unknown.
The new theme will reportedly be called "Kingdoms" and will feature two opposing factions. One will be Lion knights and the other will be dragons or snakes.
Also, KimT said their will be a new large castle!
No pics have been found yet and the release date, I guess, will be summer 2010!