Similarly, there are a few of us here who still use the Tascam FW-1884 with SONAR and Windows 7. In that configuration, it works great. Tascam stopped support of it, though, and using it in Windows 8 is a bit dicey; it can be done with some effort, we are told.
The FW-1884 is both a control surface (a great one) and an audio / MIDI interface. It would be terrific if we could get native Windows 8.1 drivers. And if not, then we throw away the giant paperweights and hope you are correct about your rumor.