Very good question, indeed! I was wondering the same. Would almost make me think of switching from Logic this time. With the announcement of the first VST Expression I felt the same way. I was glad I didn't, though. After some time it turned out, that the integration with all the different libraries out there - especially complicated ones, like VSL - doesn't make to much sense, when you make you own specialized patches.
This on the other hand is quite interesting again. Although I wonder, if it could work theoreticaly, when the VI-instance is loaded on a slave computer in VE-Pro or MIR ...