FUD Zilla writes AMD is planning to debut the SB820 southbridge in early 2010:
The new SB820 Southbridge will bring Gigabit MAC inside as well as SATA 3 with double the bandwidth, where you can expect a whopping 6Gb/sec per controller. This is one of the unique features of SB8x0 chipsets and SB850 will also share this neat feature.
Some good old features such as RAID 0,1 and 10 will also be there as well as 12+2 USB ports. The SB820 also has new clock generator, AHCI 1.2 (FIS) and a single PCI Gen 2 x4 support.