Mike Chambers just gave us all the heads up.
https://weblogs.macromedia.com/mesh/archives/2007/02/quick_apollo_up.html
So dust off your Flex Builder, stretch out your fingers, stock up on your favorite all-night-coding-binge food and beverage, and warn your significant other that one day soon you’ll be going into your office and you may not emerge for quite some time – do not disturb.
Sounds like the public alpha will still be a little rough around the edges, but I think the seismic waves will be felt around the web almost immediately.