Gaga has finally revealed a bit more about what the app in her interview with Carson Daly! ARTPOP app consists of two "engineering systems," one musical and one artistic

Trackstar: Allows users to make their own songs, a sort of DJing system
Arthaus: Create your own virtual sculptures (I think that's what she said??)

Fans will be able to upload their creations into a shared space online!

Gaga also praised Björk and the flawless Biophilia app. She said the ARTPOP app will be a bit less involved than Biophilia. Somewhere between Biophilia and apparently some Johnny Cash app? Not sure what Gaga was talking about with the Johnny Cash app though

Seems interesting.

After all the different fan edits and remixes of Aura, I thought something like trackstar would be cool on the app and allow people to make their own mixes. I hope she releases a lot of her unreleased stuff then.

Awesome!