The beta patch is super, super stable, I'd just play that. The latest official version is also really stable, but the beta does include some very good changes. Our betas aren't like most other companies.
Or let me put it another way: know what would happen if we released another official patch? We'd change the name from beta, and make it the official one. This one is ready to go, but there hasn't been an enormous time pressure to release it because the beta is stable and easy to get, and people seem happy. So we haven't gone through all the hassle with getting the next official to vendors, etc, etc.