Re: Hmmm...
Try using it. While it works, some of the features you would expect to be there (based on WS2012R2) are missing and lead to some pretty crucial holes in using Storage Spaces Direct for storage. For us, missing network features were the show stopper.
I expect it to reappear in a more mature form some time in the future.
Note: we haven't tried all the whizzy bang features to give you lots of speed (NVMe/SSD), we were just using it for cheap, high capacity storage that wasn't that critical. The speed was nice when it worked, but there are a few buts....