The Opteron triumverate of chipsets. No change in the chipsets and feature sets available from when Opteron was codenamed Sledgehammer.
2P value server configuration. This segment of the server market accounts for about 80% of the total server market, and many 2P configurations don't even have the second CPU installed. This may be AMD's easiest target, but not necessarily the best from a strategic point of view.
4P server configuration. Mutli-way server configurations, the holy grail of 'Big Iron' is what AMD hopes to get to with Opteron. 4P and up is where AMD really wants to go with Opteron.