I certainly have zero knowledge one way or the other - I believe they sometimes provide an early release for those who might be experiencing more of a show stopper kind of bug, where they might say something like 'for those experiencing crashes with xxx, or yyy redraw/rethink/redo doesn't zzz, then try the early release.
I would also say that IF any given early release, or really any release at all, causes issues that knock someone out of the water, there is always a pretty painless ability to do a rollback from Command Center, with just a couple of mouse clicks.
I think that makes installation of ANY update a BUNCH less risky, even if it is an early release.
Bob Bone