FUD Zilla reports AMD plans to release Vishera processors with four, six and eight cores in Q3 2012:
We did find out that there are three CPU versions coming in mid Q3 2012, the eight core AMD FX 8350, the six core Amd FX 6300 and a quad core AMD FX 4320. The eight-core version is expected to get to engineering sample in early Q2, so any day now, it should move to production candidate sample stage in early Q3 2012 and get to production ready and production status in Q3 2012. The launch date is yet to be decided, but this all depends on the product readiness in Q3 2012. If all goes well earliest you see Volan platform AM3+ and Vishera processors is Q3 with a possibly unlikely scenario to launch them in Q4 2012.