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by dunham 678 days ago
It's not quite a preview, but back in the 90's there was something called sym-lock.el that would render TeX escape sequences as the corresponding symbol. I have no idea if it still works, but Google points me here:

  https://github.com/sid137/emacs/blob/master/sym-lock.el
(I used it with xemacs at the time, because it had more flexible font handling.)