Update: v2.7.2 has been released, so we're switching over to the non-beta version today.
MathJax v2.7.2 has entered the public beta phase. We're setting it up here to kick the tires and help out with testing.
This release includes a workaround for a regression in Safari as well as over 30 other bug fixes. The full list of changes is available on mathjax.org.
As always, we will be monitoring this post for any bug reports or missing features.