nForce4 will be officially announced on 20 Oct 2004. There will be 4 editions and they might be changes until the final specs are release.
nF4 SLI - supports SATA 2, 2 x PCI-E, 1G HTT, Socket 939
nF4 Ultra - supports SATA 2, 1 x PCI-E, 1G HTT, Socket 939
nF4 - supports SATA, AGP 8x, 1G HTT, Socket 939
nF4 scaled edition - supports SATA, 800MHz HTT, Socket 754