Bulldozer's launch got pushed back by about a month
http://twitter.com/anandshimpi/status/74973660389183488


AMD originally wanted to launch Bulldozer at Computex but performance issues with its B0 and B1 stepping chips pushed back the launch. Now we're looking at a late July launch with B2 silicon, but performance today is a big unknown. Apparently the performance of B1 stepping silicon doesn't look too good.

Functionally the 9-series chipset is no different from the 8-series that it replaces; it'll simply be used on AM3+ boards exclusively.
http://www.anandtech.com/show/4365/c...8-motherboards