Basically, you can use your mouse and keyboard to interact with tabletop pieces with other people online. In doing so you can essentially recreate a ton of tabletop games.
It's been fun just messing around with it, but the real reason I got it is because they're slowly patching in HTC Vive support and that's really the way I want to play this game. I want to be in VR and able to reach out with my hand to interact with the table. I want to walk around the tabletop looking at the mini animated figures while playing a tabletop RPG.
I think it has a ton of potential to be cool, especially for adults since getting schedules lined up for a tabletop night of gaming is super difficult.