Perhaps my favorite new instrument of the show, the OP-1 from Teenage Engineering:

Among the attractive features are its small size, the tape mode (shown in the picture above), and the user interface which uses color coding to visually map the parameters being edited to one of the four colored knobs. The color coding was present in all the modes, including the tape mode, the sampler, the pulse-wave synthesizer, envelope generator and others.

I might have bought one had it already been available.

More info at the Teenage Engineering website.