Logitech has silently launched a new cordless MX-series mouse, the MX1000 Laser Cordless Mouse. This will probably be the successor of the MX700 mouse. The main difference between the MX700 and the MX1000 is that newer one doesn't use an optical sensor, but a new laser which is according to Logitech 20 times more accurate than an optical sensor.

More info at DV Hardware