It's too late now, but anyways a couple of suggestions, what I haven't seen in the game yet:
When it comes to presentation, I think it would be cool, if after the foul whistle, player with the ball would just shoot the ball randomly, some guys would even come and block them, like they do in real life.
like it happens here, before Iverson scores the huge rainbow shot:
http://www.youtube.com/watch?v=HxVRQHU5It0Being a bit of a stats freak, I'd also like more stats during the game, some people might find this obnoxious, why not add somekind of a slider or an option like we have already with replays. Perhaps even get scores and top scorers from the other games, not between quarters, I rarely watch that, but in the actual game.
Bring back at least the online system we had in NBA 2k11. The site was the most important part for an online league. You could customise the league, put people in other conferences, trade players among the teams, waive/assign them, DELETE GAMES (how is this not in 2k12?????) and other stuff... With online modes, 2k12 is a huge stepback, sure they added dynasty mode, but it was ridiculous.
2k11's online was far from perfect, you couldn't save sliders, team's options, playbooks and had re-adjust them every team you wanted to play a game (apart from sliders in a league, so me and my friends playing a league, created two separate leagues to have one for friendly games), but I'd much rather have all that back instead of 2k12's online.
Btw, all this is from a PC user's point of view.