Gigabyte leaked the specifications of AMD's upcoming FX processor series.
The final shipping stepping is indeed B2. The top part, FX-8150, is clocked at 3.6 GHz, with a TDP of 125W. Next in line is the FX-8120, clocked at 3.1 GHz. There are two versions - 125W and 95W. This suggests that the FX-8120 was initially targeted for 95W but may ship with a 125W TDP to begin with. The final 8-core CPU is the FX-8100, clocked at 2.8 GHz.
The sole 6-core CPU will be FX-6100 at 3.3 GHz while the 4-core CPU will be FX-4100 clocked at 3.6 GHz. Both feature 95W TDP, and will likely compete up against the Core i5 series. All CPUs feature 8MB L3 cache. This suggests that FX-6100 and FX-4100 are likely to be Zambezi with 1 module and 2 modules disabled, respectively, rather than native 3-module / 2-module dies.