I can see that wedge mouse being useful for selective tasks, but on the flip side, small travel mice that are non-dongle blue tooth connected are going to become more and more popular.  These devices are simply out there to get the other vendors collective asses in gear.
I am, however, very curious to see what touch interfaces are going to become available to supplement non-touch enabled computers.  I would personally be very interested in a mousing surface that would double as a touch interface.