To update my post... now that I have seen that the Vector in the DBII chassis did NOT get EFI, the Ventures and VK's even further from having it!
I would say now that the 1050 is on the scene with EFI, the 973 simply won't ever see EFI in a performance sled before it's phased out. That does not make the EFI future for the Venture or VK Pro look very bright unless the EFI system from the 1050 could be easily adapted to fit the 973, i.e. carb placement similar, intake tract length similar, etc.
Either way I'd say the 973 is still a minimum of two model years away from having any sort of EFI system attached to it.