IT-review has some nice pictures and info on the upcoming MSI socket AM2 offering. The top of the line K9N SLI Platinum is based on the nForce 570 SLI MCP and comes with a slew of features:
• NVIDIA nForce 570 SLI MCP chipset
• Supports Socket AM2, 64bit Athlon 64 and Athlon FX processors
• 2 PCI-E x16 slots for SLI
• Hyper Transport support speed up to 2GHz
• 4 DIMMs DDRII 533/667/800 up to 8GB
• Dual LAN 10/100/1000 and FireWire
• 8-channel High Definition Audio
• Supports 6 SATAII, storage and data transfer up to 3.0GB/sec
• SATA 1~6 suports RAID 0/1/0+1,5
• 2 PCI-E x16, 2 PCI-E x1, 3 PCI slots
• 10x USB 2.0, 2x IEEE1394
• Dual CoreCell with D.O.T. Express
• 1 MSI communication slot
• Silent Heatsink

There will be a K9N Platinum, with the same features, but not SLI capable and the K9N Ultra, which lacks RAID 5 and Firewire