These colors are Regal Peacock Green (G5Q), Some Like It Hot Red (G6K; maybe it has something to do with the red background of the official poster of the 1959 movie starring Marilyn Monroe), Jungle Green Metallic (G6P), Perfect Blue (GNT) and Alchemy Purple (GWR). In terms of visual changes, there's only one that we can mention at the moment, represented by a different front license plate bracket.
It's not known what type of six-speed manual transmission will be offered as an optional extra on the 2015 Chevrolet SS, but we have a sneaking suspicion that it will be the same Tremec TR-6060 fitted to the Australian Holden Commodore. As for the Magnetic Selective Ride Control, this suspension system basically employs electromagnets that vary shock fluid viscosity. Expect to get a button that'll let you select between different drive modes, from lofty 'comfort' to bone-crushing 'track mode'.
Just like the outgoing model, the 2015 Chevrolet SS will retain the 6.2-liter LS3 V8 motor rated at 415 horsepower and 415 lb-ft of torque at 4,600 rpm. Even the 3,975 lbs (1,803-kg) curb weight for the base automatic variant without the MagneRide trick suspension is unchanged from the 2014 model year.