Under the current framework, there is no way to get the typeset correct answer. I think the reasoning for this was that the correct answer was to show what the students should have typed, and so it should be text, not typeset.
There is also an issue of screen real-estate to deal with. The answers table already has too many columns, and adding another would really make it difficult to format well. We have talked about some ways to improve that, like clicking on the correct answer to get a popup typeset version or something similar, but nothing has been done on that yet.
There are some internal technical issues that I would like to see addressed related to the answers table, in particular, in the ability for the answer checkers to specify the result in various formats (HTML, TeX, answer sting, etc). Currently, these are not well separated in the answer hash.