They are the Wireless Laser Mouse 6000 and 7000. There really isn’t much new here, they have some custom buttons for Windows Vista and one of them is meant for on the go use, the other for stationary desktop use.
The 6000 is the one made for use on the go, it is a full sized mouse, but has the snap-in transceiver like that of smaller portable mice. The 7000 has a vertical recharge stand and is clearly meant for the desktop.
They both have some pretty amazing battery efficiency and they both have MS’s HD laser tech as well as the wireless tech on the 2.4GHz band for distances up to 30 feet. The extra buttons are for Flip 3D, Magnifier, and tilt wheel. These mice will be available in March for $50 and $70 respective to their numbers, or you can pre-order them now.