I wonder when they will open up the public beta for Yosemite. I would love to get my hands on it.
I would strongly suspect that the public beta won't be an all-new version but will rather be announced by e-mail a day or two after the developers get their hands on it. (For extra safety in catching critical bugs as well as spreading out server loads.)
So for all we know this could be the public beta, but we won't hear about it unit later this week.