Modular MPE devices that are wireless (Bluetooth) and can work with essentially anything. Used to be only configurable with Apple products but they've finally realized there is more than just hipsters into making music and have got Windows and Android software out as well now.
Similar thing as the Linnstrument and the infinitely superior Hakan Continuum. (it is the rolls royce of the MPE controller) (that is of course not to say that the Linnstrument is inferior, it is fantastic as well. Is also considerably cheaper than the continuum.)
Basic premise is it/they allow you to have the same kind of control of your sound as that of an acoustic instrument. You can for example play your synth like a guitar with lots of whammy bar and power slides. You can play your synth like a violin, etc.
It is basically what I've wanted since I first got into synthesis.