Toyota is still finding ways to improve the GR Corolla. After adding an eight-speed automatic transmission and bumping torque from 273 to 295 pound-feet last year, the hot hatch is due for another upgrade. Until the full debut this fall, this camouflaged development prototype will have to make do. Despite the disguise, there are some notable changes over the regular model, hinting at the prospects of a GRMN variant or a different special edition.
