The new MCP will have the same features set as the upcoming nForce3 250Gb chipset. The sources report that the new MCP for nForce2 will have native support for Serial ATA RAID and NVIDIA Hardware Firewall. Unfortunately, according to our sources, the upcoming new MCP for nForce2 will lose their APU. This way the mainboard manufacturers will have to choose if they would like to offer mainboard with the integrated APU or with the NVIDIA native Serial ATA, but not the both.Source: X-bit Labs
We do not know yet, what is the exact launch schedule for the new MCP, however, they should evidently start shipping within the same timeframe as nForce3 250, i.e. in Q2 2004.
NVIDIA to announce new South Bridge

According to some rumours NVIDIA is going to announce a new nForce 2 South bridge (MCP) family with lots of new features.