Updated models with AMD graphics options expected in early 2017.
Bluetooth Mighty Mouse? [Updated, Released]
The new Mighty Mouse uses two standard AA batteries and will be compatible with OS X 10.4.6 and later. 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.
MacRumors recently received word that Apple repair technicians and phone support had been briefed on how to deal with the new hardware, indicating a release may be imminent. The Mighty Mouse was introduced in August 2005.
Update: According to a picture of a preliminary product manual obtained by AppleInsider, the new wireless Mighty Mouse will use Laser tracking in place of the Optical tracking system the current USB Mighty Mouse uses. Laser-based mice typically are more accurate and less prone to errors on extremely smooth surfaces.
Update 2: Apple has released the Bluetooth Mighty Mouse. Features not found in the previous version are bluetooth wireless capabilities (of course) and laser tracking.