I'm going beat everyone to the punch and save you massive scorn....the current Wizard has GPRS already in it! GPRS stands for General Packet Radio Service, and is one of the ways Wizard (and many other phones) receives data.
Might you be referring to GPS (Global Positioning System)??? Wouldn't make sense for HTC to release an upgrade to Wizard with GPS as they release brand new models all the time (every few months it seems like). More than likely there is a phone out there that resembles the Wizard with the nifty slide out keyboard that also has GPS among other improved specs. Check out the wiki for other HTC phones (http://wiki.xda-developers.com/
Devices: HTC Wallaby, HTC Wizard, HTC Titan, now HTC Flyer