I have been hearing some solid rumors that OS 6.0 is coming this year. The team @BBLeaks just posted some screenshots they were sent by one of their sources who claims they are of OS 6.0. Its hard to tell if this is truly a new OS since it could just as easily be a widget or app or even a mockup.
Still it is truly fun to think about how RIM could wow us with OS 6.0. I am really hoping they hit the ball out of the park with it. OS 5.0 was a great move towards stabilizing the fragmentation they had with OS 4.2-4.7 but hopefully OS 6.0 will pile on the features.