When I called about my Order Status regarding the upgrade to iLife 08, the girl also mentioned that I was receiving the new wireless Mighty Mouse. I kinda shrugged it off since I heard nothing about it, but reading this, it could be true. It was delivered today so when I get home I'll find out if its new.
I found this on MacNN. Looks like the changed the color of the two squeeze buttons, at least I think..
Other products have received minor, cosmetic updates. Both the wired ($50) and wireless ($70) Mighty Mice are now coated in white on the sides, rather than gray. The Apple Remote ($30) is actually entirely the same, but the wording of its packaging is said to have been modified for "North America compliancy reasons."
Just opened the box to my Wireless Mighty Mouse, the buttons definitely look a lot lighter than in the pics on the internet. I wouldn't call them white, more of an off white, incredibly light gray. Other than that, it looks the same. Only a few minutes with it and I love it! Side buttons are perfectly placed for the way I hold it, scroll wheel is amazing, its ability to sense left and right click is excellent.
Sorry for the iffy quality, I took it with my camera phone. Now that I look at it, it looks no different than the old one: