It was mentioned in an IRC interview log with one of the AOS4 developers that they have a fully commercial and ready release of OS4, but no hardware at the time.
They have a list of things they're still working on, which would have wound up in a boing bag or service pack down the road, but all these fixes will instead wind up in the final release since they have the time.
I believe it's as ready as any other OS though. They've got a rather unique predicament.
