Yeah, for the most part the gameplay was pretty solid in 2K10 (besides a few things such as the lack or errors and injuries obviously). They finally laid a fairly strong foundation last year. Now they just need to build upon it and smooth out the kinks.
If they can improve some key things, I'll be very happy:
1.) Add errors and injuries
2.) Make the pitching more of a challenge (it's too easy to pinpoint your pitches once you get good at the motions) or add a pitch accuracy slider. This should also help the AI hit for more power because we won't be able to constantly nibble the corners.
3.) Improve the animations in general
4.) Decrease the pitcher's fielding ability. Too many scorched balls up the middle are effortlessy gobbled up by the pitcher.
5.) Also for fielding, make the right stick throwing more like it was in 2K8 where the placement of the stick affected the accuracy of the throw.
That's really all I want. Based on what VC has done so far with this series and especially the progress they made with 2K10, I'm optimistic for 2K11. It would be nice if they released info sooner, but we'll have plenty of info soon enough.