Intel's next Southbridge chip, the ICH8, will lack P-ATA support and won't have AC'97 either. Instead the chip will feature more Serial ATA ports, 10 USB 2.0 ports and more:
As expected, the part will support Intel's Active Management Technology, which will presumably give remote systems managers the ability to engage another ICH8 feature: USB port disabling.
The slide also suggests Broadwater chipsets will support up to six 3Gbps Serial ATA ports and host six PCI Express x1 lanes. The South Bridge will integrate Gigabit Ethernet. An "advanced" fan control system will help to keep system temperatures down, part of Intel's performance-per-Watt philosophy.