From The MathJax Team:
After a successful beta run, we’re happy to officially release MathJax v2.3.
MathJax v2.3 is available on the CDN, and for download from GitHub or via the download page at http://www.mathjax.org/download/.
Version 2.3 is available on the CDN at
http://cdn.mathjax.org/mathjax/2.3-latest/MathJax.js
and starting today the files at the
http://cdn.mathjax.org/mathjax/latest/MathJax.js
address will be switched over the v2.3; it will take 24h-48h for the changes to propagate out to the distributed cloud servers.