Several months ago a survey was done and the most requested major features were table support, security features and math support, in that order. The developers are working on tables and have indicated it's going more slowly than anticipated. So I don't believe we'll be seeing math support for quite a few more months.
I use Marked 2, a previewing app, that integrates wonderfully with Bear. It will render math syntax such as LaTex. It also provides support for TOC, footnotes, tables, and much more. I highly recommend it. The Bear developers have already included the command to activate it under Note>Preview in Marked.