Those paying close attention may have noticed we haven't released Review Board 1.6 yet. And you may have wondered what's holding the release up. Well, there are two main things.
First, some of our users have hit problems upgrading to Review Board 1.6 RC2 from previous 1.6 betas. This seems to be limited to some subset of our users, and it's not clear whether it's a bug on our end or not, but I want to understand the circumstances surrounding this problem before we perform the actual release.
Second, the 1.6 manual isn't finished yet. We try to fully update the manual before the release, but this does inevitably delay things. We're working on getting someone who can in the future help out on documentation updates, in order to speed up the releases.
Once we're satisfied with the above items, we'll do a release. In the meantime, if you're looking to start using 1.6 sooner, you certainly can! The RC 2 release is largely what we're shipping in 1.6, excluding a couple of small fixes. However, please do a test upgrade on a copy of the database to ensure you don't run into the problem above. And if you do run into it, let us know! More data will help us to solve this faster.