UPDATE 2: We now have confirmation on the below from WarnerBros.
LEGO Dimensions packs based on 16 new entertainment properties will begin launching on September 27, 2016 with the Ghostbusters Story Pack, Adventure Time and Mission: Impossible Level Packs, Harry Potter and Adventure Time Team Packs, and The A-Team Fun Pack.
Additional expansion packs based on other highly anticipated films Fantastic Beasts and Where to Find Them and The LEGO Batman Movie and wildly popular properties The Goonies, Sonic The Hedgehog, Teen Titans Go!, LEGO City Undercover, Knight Rider, The Powerpuff Girls, Gremlins, Beetlejuice and E.T. The Extra-Terrestrial will be released in product waves stretching into mid next year. All expansion packs provide players with continued compatibility to use everything from waves 1-9 interchangeably, anywhere throughout the game. And no new starter pack is required, as all new packs will simply enhance the LEGO Dimensions Starter Pack game and work with the existing LEGO Toy Pad.