It looks like the Socket F Opteron will be hitting the markets later than expected, with AMD delaying the release of the next-gen CPU. Though the impact on home users will be minimal, Opterons have become very popular in both businesses and for enthusiasts. The delay is artificial, it seems, and is a market strategy to make sure the launch doesn't conflict with similar launches by Intel:

The delayed availability of AMD's Socket-F Opteron processors is part of the vendor's carefully-crafted launch strategy, as the next-generation dual-core Opteron is arriving between Intel's current 65nm dual-core Dempsey and Woodcrest offerings and the upcoming quad-core Clovertown, whose launch is slated to take place in the first quarter of 2007, the sources indicated.
Come August 1st, 3 weeks after the original date, the new chips should arrive.