Now, even cool devs like vomer are entitled to have a life. Will the world stop moving if you get an m preview next week? Maybe after a dev gets a chance to actually test it, see if there is any benefit, who knows what.
So don't wait to get reprimanded for asking ETA- There are already threads popping with instructions how to download and install image- everyone can plunge and install it with a few keyboard strokes. And flashable zips are not far away.
For a preview.