The listings mention the contents of the Starter Pack as being 2 Skylanders SuperChargers figures - a new Skylander named Spitfire and a reposed Super Shot Stealth Elf, and one Skylanders Vehicle called
A brief plot summary is detailed:
Quote: Amazon.com
Skylands is in peril! Kaos has unleashed his most evil weapon yet - the Doomstation of Ultimate Doomstruction. With all of Skylands on the verge of collapse, a special team called the SuperChargers has been assembled to pilot an unstoppable fleet of incredible vehicles. Now you and the SuperChargers must embark on epic adventures over land, under sea, and through the sky to stop Kaos and save Skylands!
There are listings for PS3, PS4, Wii U, 3DS, and even a version for the Wii (albeit with a note saying that the "gameplay content, features, and functionality will differ") but no potential release date is given.
It shouldn't be too much longer before we find out whether this is accurate and we get our first proper look at the game, rumours place an official reveal happening on Wednesday, the 3rd of June.