Toyota is developing an upgraded version of the GR Corolla.The camouflaged development prototype features vents in the hood and front fenders, a larger rear wing, and 18-inch matte black BBS forged wheels.The turbocharged 1.6-liter gasoline engine is expected to have increased torque, but specific details have not been disclosed.The GR Corolla development vehicle will attend the Formula Drift event in Long Beach, California, before its official premiere.