Hi Patrik,
ad 1. MIR Pro will work with any source: VI, VI Pro, 3rd-party VSTi/AUi, or audio streams. Of course the features which need Vienna Instruments to work properly - i.e. all the Instrument Profiles, Natural Volume and the like - will (have to) remain VI/VI Pro-exclusive.
ad 2. We work on a solution, but it's to early to go into details.
ad 3. Wherever the actual MIR engine is instantiated, the calculations will take place - be it the master or a slave connected via LAN.
ad 4. Yes.
ad 5. MIR Pro will allow any modern host to compensate for its latency.
HTH,
/Dietz - Vienna Symphonic Library