Cadillac is working on an electric Escalade, and a prototype has just been spotted. The prototype shows to the Escalade IQ won't simply be a clone of the current gas-powered model. Instead, it looks like it will have distinct exterior and interior designs.

Nissan's latest Z sports car has spawned its more hardcore Nismo variant. The new version brings extra power, aerodynamic mods, and a stiffened chassis, all designed to improve the Z's performance at the racetrack. In a surprising move, the car also ditches the Z's manual transmission in favor of the automatic.

When the redesigned Ford Mustang hits showrooms this summer, the lineup will be topped by a new track-focused variant called the Dark Horse. It's similar to the previous generation's Mach 1 grade, but performance has been given a substantial boost, as we discovered in our recent first drive.

You'll find these stories and more in today's car news, right here at Motor Authority.

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