Beta goes GA!
After lots of bug reports (thanks all!) and fixes, the beta version has now replaced the old stable one on https://reviewable.io. Visits to https://beta.reviewable.io will redirect automatically and there's no longer any way to access the old stable version. But of course if you run into any bugs or regressions it'll be my highest priority to fix them.
Now that there's a new stable platform to build on top of, it's onwards with new features! Next up are a simplification of the discussion semantics and integration with GitHub's review system.