Ongoing discussion at:
http://www.aximsite.com/boards/showthread.php?t=131246
Bluetooth still sucks, but overall the few who have tried the update (myself included) think it seems somehow "snappier."
There are a few differences, minor updates to built-in software and the like. I don't have any CF cards to see any differences there though.
Definately an update to annoy those who want their bluetooth headsets to be supported by Dell. ;)