Car Mastery Update

The Summer Update is the v2.0.0 update of Asphalt 8: Airborne, it was released in July for iOS.

Announcement
The following text was published on the Apple Store:

Crank up the AC, because the summer wind's blowing a hot new update your way!

Whats new:
 * Car Mastery: Take on a series of over 1,500 special challenges to win exclusive & iconic cars!
 * 8 NEW CARS: Spark a fire in your soul with the McLaren P1 GTR, Mitsubishi Lancer Evolution X, McLaren 675LT, and more.
 * NEW DECALS: Because you can never have too many customisation options!

Overview
The Summer update added 8 new cars:
 * Datsun 280Z (Class ?)
 * Camaro Z/28 (Class ?)
 * Shelby Cobra 427 (Class ?)
 * McLaren P1 GTR (Class ?)
 * AC 378 GT Z (Class ?)
 * Mitsubishi Lancer Evolution X (Class CD
 * McLaren 675LT (Class ?)
 * Chevrolet SS (Class B)