Just saw the announcement of the new “Surface Dial” from Microsoft. I could see countless possibilities for that in Cubase. Will probably only be for Windows, but as a Windows user myself, that would be fine 
Also in general it would be great to have good touch support in Cubase - again only for Windows. I could totally see myself using a Surface Studio with the Surface Dial for composing and editing music. If not with Cubase, then other competing apps like FL Studio Groove