MathJax v2.3 will focus on fonts. This includes additional font options (STIX webfonts etc) and better font support in MathML output. The release will also improve localization support and will include bug fixes and minor enhancements. Please add high level items to this milestone.

• add STIX webfonts
• add Neo Euler webfonts
• add Asana webfonts
• add Gyre Pagella webfonts
• add Gyre Termes webfonts
• add Latin Modern webfonts
• support new languages
• add MathJax to TranslateWiki

- [ ] enable webfonts in MathML output

See also https://github.com/mathjax/MathJax/wiki/Mathjax-v2.3-feature-discussion