All four processors are dual-core and will have 2x512MB cache. The fastest of the four announced processors, X2 5000+ will work at 2.6GHz.
Unfortunately for AMD, these processors won't completely bridge the gap between AMD's finest and Intel's Core 2 Duo chips, which will stay in the lead. This is just a step in their transition to 65mm, which was necessary for AMD if they want to keep putting out energy-efficient chips.
The prices for the four chips will be as follows: 4000+ will cost $169, 4400+ $214, 4800+ $271, and 5000+ $301.