There was a beta build on 10 December, but that's it.
There are multiple reasons, that I don't recall offhand. But it's mostly fallout from switching to rustbuild by default. @alexcrichton is working on it.
Nightly today is looking good. Cross your fingers and hold your thumbs and stuff and it might happen.
So Excited! I have my fingers crossed!
Nightlies failed again, and the fix is in for another try tomorrow. Sorry for the hassle. FWIW we're transitioning to a new CI architecture that should prevent most nightly breakage. I'll post more about it soon.