AMD presents "The Bulldozer Blog"

[Jowy Atreides]

Any word about running on AM3 or not?

Yes but in a nonspecific way.

it will be backwards compatible so you won’t need to change anything to start using the processor"

Source - AMD
http://blogs.amd.com/work/2010/08/02...ulldozer-blog/

looks like AM3 compatibility confirmed