The lack of any real information about FX Bulldozer, AM3+ sockets does make things tricky and it is a bit of a minefield at the moment.
The only thing I know for certain is that the new AM3+ Sockets are being fitted to some of the Gigabyte motherboards. This tells me that a simple BIOS update is not the solution and a new socket is going to be required to be able to run the new processors when they come along. This has been my understanding all along, that the FX Bulldozer processor will be AM3+ and that they have an extra pin. This would mean they won't fit in an AM3 Socket but that the current AM3 CPU's will fit in the new sockets.