The pic of the actual CPU doesn't matter much, when now 3 (recently asrock is selling am3 mobos as am3+ mobos as well) are selling am3 mobos as am3+ compatible. So I think it's safe to assume that msi, asus and now asrock aren't wrong on that front.
It is worrying, though, to hear AMD saying one thing and now these manufacturers saying another. I'd be willing to bet there may be some drawbacks to dropping in a bulldozer into an 800 series am3 mobo. Either that or AMD has backtracked and hasn't told anyone but the manufacturers 😛