The new CPUs come in 5400+ and 5600+ variants, but the clock speed for both is the same: 2.8GHz. The difference is the amount of L2 cache per core. While the 5400+ comes with X2-typical 512KB per core (total: 1MB), the 5600+ comes with 1MB of L2 cache per core (total: 2MB) giving it equal specs to top-of-the-line AM2 CPU, the Athlon 64 FX-62 and the newly introduced FX-72 (the one using Socket 1207FX).
The price of 5400+ and 5600+ (in 1000s) is $485 and $505 US respectively, filling a handy gap gap between 5200+ (currently $403) and the pricey FX-62 ($713).
Soon AMD will also release the 5800+ and the 600+.
Also in the news is a renaming of ATI's chipsets. The Radeon Xpress 1600 and 3200 are now known as the 480X CrossFire and 580X CrossFire.