One of the Oxide developers, Kollock, has posted a few more information. He now says that NVIDIA is not done with Async Compute support in their drivers yet, and they (Oxide) are working with NVIDIA to get the driver part of that done, before its properly enabled in the driver.
Until a driver actually enables that feature properly, everything else is just speculation. Today, it cannot use the Async Warp Schedulers on the Maxwell GPU - but if the driver support is finished, the picture may be quite different.
Software scheduling may be less efficient than full hardware, but its not "no support", and until we see how the end result looks, i'll keep an open mind, in any case.
Summary here:
http://www.guru3d.com/news-story/nvi...r-support.html