I have to believe it is not patched in yet. you should be able to pull back on the RS while swinging and get the check swing animation. But it's just not there.
This has really affected my ability to hit, as last year I could start a swing and then stop when I decided it was a ball or not what I wanted. I find myself pulling back to no avail this year.
The little stuff that prevents me from making strategic moves is starting to bug me. You can't leave a pinch hitter in the game. You can't view the other team's bench or bullpen, nor any of their L/R/S status.
I had a really bad AI decision in game today, when the Mets pulled Johan Santana from the game after seven inning, holding a 2-0 lead. He was throwing a perfect game against me, and had minimal pitches in.