It's not too hard to understand why no numbers are up yet.

If you take marketing and customer reactions into account:

If BD is released on Servers first, then AMD should keep performance secret as server products often involve million dollar contracts for high volumes. Magny Cours is a competitive product and sells very well, and releasing BD performance numbers could affect millions in MC sales. Intel often releases desktop chips before migrating them to server, hence MC sales should continue to do well until Bulldozer.

If BD is released on the desktop first, then AMD should release some benchmark numbers, as they are only competing on price/performance segment in this market, expectations of near future high end products that could beat the competition could hold customers from buying them. Sandy bridge is just around the corner and AMD customers on the desktop would prefer to see whats coming now rather than later.

My understanding is that BD is coming on Server markets first, hence all the quietness from AMD