I always ask myself, why nobody ever talked about using a GTX970 ITX (170mm, or the 206mm version from Zotac) and a longer, blower powered one. The short would not interfere with the longer's cooling since it'd be away from the air suply from the loger one.
I bought a Gigabyte mITX 970, but I may just wait until this releases. Have you hear back from ASUS as to when this will be available? It's been two weeks .