well the thing will probably only connect via wifi and i doubt that it will run a proper "desktop" OSX. what might be possible is to install a vnc client, this combined with screenrecycler would allow you to have the tablet work as an external monitor for your main machine. now this would obviously have latency implications.
as for what to actually run on that second monitor. taktor is out and will remain out for the next 1-2 years as NI UI is stuck in the stone age. so for get about touch interface, forget about multi monitor support.
ableton might be more feasible, but they also do not have multi monitor support, but they at least try to be friendly to touch (or at least pen's).
now what could of course happen is an advanced version of iTM DJ or TouchOSC, again with latency via wifi, but that could then be used to control pretty much anything and could become a very good addition if only to display the current values of double assigned knobs on your current control surface (such as a vci-100).
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