Pandoc and Mediawiki have been able to convert embedded LaTeX to MathML, for a while. Once Chromium supports MathML most CMSs will probably start providing suitable converters, and in the meantime MathJax will still work (and better, since MathJax's Native MathML output is faster than its CommonHTML one[0]).

[0] http://docs.mathjax.org/en/latest/output.html