I also wonder why the Bulldozer cores. At least in the PC, they're awfully inefficient for games. The desktop versions are heavily surpassed not only by Piledriver but also by the former K10/K10.1 CPUs in performance/watt.
Maybe it's actually an "Enhanced-Bulldozer", which means it's actually a Piledriver or a Steamroller.
imo, they needed 8 cores and they took a bulldozer... waiting for the 8 cores jaguar.