It should be out early fall. As for people using it now, there are many. Check out the beta OS subforum for findings and discussion about 5.0 on the 8900 and 9000.
Question regarding 5.0. Do software updates upgrade ALL current Blackberry Devices or just the latest batch? Does 5.0 upgrade the Pearl and Curve as well as the Tour and STorm?
There are numerous posts and reviews that the leaked blackberry OS 5.0
is bug infested. Some problems include apps disappearing, some not
installing, some not even compatible.
Talked to blackberry about this issue. They said that the curve 8300 series will be supported and the carrier will know more when it will be available to the general public.