On Anandtech
Apple has submitted a filing with the FCC for the Bluetooth version of its single-button right-clickable mouse, the Mighty Mouse. The new mouse will be exactly the same as the current Mighty Mouse except for its wireless feature. The mouse comes with a single button that does both left-click and right-click duties. One omni-directional pointing ball in the middle allows you to scroll in any direction.
The new Mighty Mouse uses two standard AA batteries and will be compatible with OS X 10.4.6 and later. Some users reported that the Mighty Mouse had some issues with right clicking, and often times the single fat button would click both sides of the mouse. It is unclear whether or not this has been addressed.
No release date is set for the new Bluetooth Mighty Mouse -- currently codenamed M6, but judging from the FCC filing, the new mouse should arrive soon.