I saw a post once that I cannot get out of my head. Maybe it's not Tesla. Maybe it is a 'quiet arrangement' with the regulating authorities, i.e., NHTSA, to slow the roll or NHTSA will slow it for them. I mean it kind of makes sense. If word got out that regulating authorities were behind that, it could slow FSD purchases. But there are safety concerns and I believe there is a balance between wanting to roll it out, and repercussions if they do. I mean I am sure Musk would love to release the entire 'beta' to the fleet if he had his way.
I do believe, however, that the next point release will be the release that expands it. Probably a few more weeks would be my best guess.