Hope it's not Bluetooth - it would have to deal with Logitech's not-so-good Bluetooth implementation. Never mind Logitech's lack of support for Vista etc.
The new MX has taken 2 years to develop. It features a type of gear lever inside that intelligently switches scroll speed. They claim it can potentially save upto 2 hours work, if you scroll alot! The mouse was completely under wraps until yesterday (I know because I had to sign an NDA along with everyone else)! Anyway, 1k is too pricy for me, I'll stick to my MS Optical USB mouse thanks!