We just posted that the Bulldozer release might be pushed back towards Q3 this year, though not 100% sure. Four new FX-series processors based on the Zambezi architecture seem to be added into retail in September 2011 according to the slide down below.
Two of these chips, the FX-8150 and FX-8100, feature an eight-core design and have 8MB of Level 2 and 8MB of Level 3 cache memory, while the other two chips, the FX-6100 and FX-4100, packs six and, respectively four, processing cores.
The FX-series CPUs come with an unlocked multiplier and support DDR3 memory with a maximum frequency of 1866 MHz and AMD's Turbo Core 2.0 technology.
Clock speeds are ntor evealed but with AMD's naming scheme you can quickly do the math, the FX-8150 should be clocked higher than the 3.8GHz FX-8130P, while the other CPUs are expected to be slower than their soon to be released counterparts.
Here's that slide, click on it to enlarge the screenshot.