Nope, it's in full release now, has been for a while. However, the release is not publically available to most. You have to be a large customer or have a MSDN subscription to get it. Should be out in retail in a month or 2. I noticed that computers shipping now come with a free upgrade when available.
i usually upgrade my systems after a major service pack has been released. Btw, I tried an early release about 8 months back on an old system and found it to be quite buggy at the time.