It's being reported that nine (count 'em) new media properties are being prepped for an appearance in Lego Dimensions 2. Australian site Press Start is the source of the rumour, and claims that the news will break at this year's E3 event.
The IP includes (deep breath) Sonic the Hedgehog, Adventure Time, Harry Potter, JK Rowling's upcoming Fantastic Beasts & Where To Find Them, The Goonies, Ghostbusters (based on the 2016 reboot), Powerpuff Girls, Teen Titans and Mission Impossible. Phew!
While the previous approach has been to add more sets to the core Lego Dimensions experience, it would seem that these new offerings will be part of a fully-fledged sequel.