YouTube user GameUnboxingReviews made a video going over every announcement for Lego Dimensions that happened during Comic Con 2016 and it covers a lot of ground. Some of the stuff he comments on includes the following.

In this video I showcase new screenshots, gameplay and discuss new character abilities. As well as that I also talk all about the Fantastic Beasts and Where to Find Them, Adventure Time, Gremlins, Sonic The Hedgehog and E.T. Packs in Wave 7 of LEGO Dimensions – Year 2 Pack lineup.
Sonic The Hedgehog Debut Trailer: https://www.youtube.com/watch?v=EgqMl…
The A-Team Trailer: https://www.youtube.com/watch?v=v8iHI…
Harry potter Gameplay: https://www.instagram.com/p/BIQaWXvjy…
My Twitter: https://twitter.com/GameUnboxing

• Sloth’s mini-figure unlocks other characters from The Goonies to play as, not unlike the Year 1 Ghostbusters figure
• Jake from Adventure Time has his transforming ability and can even turn into the Jake Suit which other characters can hop into
• Adventure Levels detailed for IP like Harry Potter
• Speculation: Mr. T’s Mini-Figure could unlock access to other A-Team characters
• New Level Pack Announced for The Fantastic Beasts & Where to Find Them IP
• Sonic the Hedgehog Level Pack Announced: Massive Adventure world blending zones across the series (Green Hill, Chemical Plant, Aquatic Ruin, Carnival Night, Ice Cap, Sandopolis, Lava Reef, Death Egg, ect) & Level that lets you play through re-creations of zones like Green Hill Zone, Emerald Coast & the Death Egg. Sonic also comes with the Blue Comet from All Stars Racing & the Tornado Biplane
• Cyborg’s Mini-Figure from Year 1 unlocks the Teen Titans Go Adventure & Battle Arena Content in addition to changing his appearance to match his TT Go incarnation.