I have three Dell ST2340T 23.5" touchscreens, though I have disconnected the one in the studio since I got Cubase iC Pro for our Samsung Note 3s. I still might use it to mirror the Note showing the time location, so I can read it without my reading glasses when doing YouTubes, though it doesn’t need touch for that.
Cubase makes NO concessions to touch at all, in that like any other Windows program on a touchscreen, touch is basically the same as clicking with a mouse. There are no gestures, and no multi-touch support, so you cannot do things like manually multi-channel mix on-the-fly!
The other thing is that Cubase does not have touch-friendly versions of controls, so things like scrub, which would be just as useful as hardware controllers if the controls were the same size as on them, is even more fiddly than the tiny controls are to use with a mouse.
That being said, it is easier to just reach out and touch a control when your hands are full with an instrument, than reach for a mouse.
I suspect that unless OSX goes touch, Cubase may be hamstrung, because Windows versions, if taking advantage of the opportunity to have more touch options (gestures and versions of controls), could really depart from the common code base to more than SB may be comfortable with.
Oh, and ignore those – who don’t have touchscreens – that display huge paranoia about Cubase turning into a giant iPad DAW. Touch is really just another way to interact with Cubase, and like any other input medium, there are situations for which it is good, and others for which it is poor, but it would be helped a lot if SB catered more for touch.
Search the forums for other threads about touch.