OCWorkbench informs us about the upcoming Abit AX78 motherboard which uses the AMD 770 chipset with SB600 south bridge:
The ABIT AX78 supports the new AM2+ socket with 2600MHz HT3 with a 16bit up/down HT3.0 reaching 5.2GT/s. The board is based on AMD 770 with SB600 south bridge. It uses a x4 A-Link II interface for connection to the North and South bridge.
On board is 4 x 240 pin DIMM supporting up to 8GB of memory of DDR2-800. There is onboard PCIe GbE, 7.1 HD audio codec, Auto jack sensing and optical S/PDIF out.
There are also ABIT Engineered features including abit SoftMenu, Silnet OTES, EZ CCMOS switch and the board uses 100% Japanese capacitor.