One of our readers informed me that ASUS listed a new AMD Socket AM3 motherboard on its website, the M4A785TD-M EVO. This microATX model uses the upcoming AMD 785G chipset, SB710 southbridge, and ATI Radeon HD 4200 integrated graphics with DirectX 10.1 support. It has support for 1800MHz DDR3 memory and uses conductive polymer caps. You can check out the full specs at ASUS.
This motherboard supports AMD® Socket AM3 multi-core processors with unique L3 cache and delivers better overclocking capabilities with less power consumption. It features dual-channel DDR3 1333 memory support and accelerates data transfer rate up to 5200MT/s via HyperTransport™ 3.0 based system bus. This motherboard also supports AMD® CPUs in the new 45nm manufacturing process.
The ASUS M4A785TD-M EVO hasn't been officially announced yet, but will likely be released later this summer.