I'm a little late to the game. I just upgraded to AS 4.2 Beta HOPING it would allow me to finally sync via BT BlueSoleil. Unfortunately still no luck via BT. Desktop (Win 2000 Pro SP 4) and PPC (WM5) see each other and will connect, but still cannot connect to AS.
When syncing via USB craddle, that works fine. Like other above, saw no differences from AS 4.1