Toyota will unveil its upright Prius MPV at the North American International Auto Show in a couple of weeks, a rather more roomy and practical version of the hybrid that really started it all. And, of course, the plug-in model we tested in October will be surely rocking the floor. Now we're hearing that another as of yet unreleased Prius will be on display, simply referred to as a "Prius concept vehicle." Concept cars of course range from the mundane to the insane, and knowing Toyota we're guessing this one will fall squarely into the former category. Just the same we're hoping for a tire-shredding, slalom-eating, RWD hybrid Prius Supra model. We'll be there in Detroit when the unveil happens and we'll be sure to bring some tissues to wipe away our tears of disappointment.