They will introduce new models this year, before june according to some sources.
Some things are for sure:
- Santa Rosa (800 FSB Merom, DDR2-800, 802.11n and a few other goodies).
- Newer graphic chips based on G80 and R600. Even lower end chips will be fairly powerful, as Windows Vista requieres a decent chip to run Aero.
They might introduce a new docking station with PCI Express architecture. If they add eSATA and such, it will probably be trough there.
Hopefuly... and I'm crossing my fingers on this, led backlights...