The most powerful flavour of the new core-logic series – MCP72XE – is projected to consist of two chips so that to support two PCI Express 2.0 x16 lanes for two (or more) add-on graphics cards and three PCIe 2.0 x1 lanes for other expansions. The enthusiast-oriented MCP72XE will also support memory modules with enhanced performance profiles (EPP), 1GbE network controller, six Serial ATA ports with RAID capabilities, two Parallel ATA drives, twelve USB 2.0 and other capabilities.
Whether or not new interfaces provide immediate performance benefits, most manufacturers often make plans sooner rather than later to begin migrating. We saw this with the move from IDE to SATA, from PCI to AGP, from AGP to PCI Express and in many other interfaces as well. Likely it'll continue this way, though hopefully companies like Nvidia will stick to what they have been in doing in offering cards in multiple formats for a long period, giving people ample time to transition and not abandoning customers with older equipment.