Yeah, what @zebra said.
Now that I have one of these in my hand, the thought of being able to use the norns by itself to compose/perform music is indeed very compelling. It would be great to use/study what has been done already.
From an HCI standpoint, I feel like you could get a lot of expressive control out of the norns’ limited interface, at the expense of maybe a bit more cognitive load. The form factor is also very intriguing too. Like, does anyone use it like a handheld console? When you hold it with a portrait orientation, it looks/feels like a martian gameboy. Seems like you could build some interesting applications around that.