Well, I installed this update in between games, so I didn't bother testing to see what unannounced enhancements were made to the functions until game time, Saturday night. I seems that the 51-pt. 3-D tracking is faster, plus I don't have to hold my shutter button halfway down along with AF-ON anymore. That's a pleasant plus. AF in this mode seemed to hunt less than before, and really stuck with subjects much more efficiently than before, as well.