There was a lot of information leaked last year (i.e. Like here), but the only official word is here:-
It will allow specific programming (via the API) for devices to interface better with Cubase. It should be a game changer - but who knows until it’s released.
Shame they didn’t put it out to a public beta test really, as the scope is so wide when it comes to controllers, and Steinberg generally lose focus on new features very quickly after the first year of development.