Just finished mine as well - and there ARE more options in various menus. Previously I could not get it to display the device number anywhere - pioneer guy I talked to at support said it will display when I boot from the SD card, and he was right. now, however, I have a new system info option that includes telling me the device number.
910BT, here's what mine updated:
APL - 2.020100 > 4.000100
DATA - 2.000100 - 3.000000
Map - up to 3.0 now, didn't display previous version.
Unit IS more responsive, and I just did the firmware update in May, so I had thought mine was as current as y