Our photographers believe these mules hint at an all-new hybrid model, which makes us think of the Blue Will concept from the 2010 Detroit Auto Show. At the time, Hyundai said the concept could be a preview of a future dedicated hybrid that would compete with the Prius.
We don't know what it all means for sure, but our spy photographers found four heavily modified Elantra GT prototypes driving around with a standard Prius and a Prius V. As if that wasn't enough of a clue, the four changed Elantras represent different approaches Hyundai might be using to go after Toyota, since there were two versions driving by our photographer's lenses, with different rear extensions indicating that both the standard Prius and the larger V might be in Hyundai's sights.
Despite the inclusion of a battery pack and a high-voltage cable running under the car, there was no obvious sign of a plug, so the old rumors of a Sonata PHEV will likely remain in the dustbin for now. Unless that strange rectangle of tape on the gas cover is hiding something surprising, of course.