By preview-latex on can render latex formulae inside a tex buffer. The package px package renders latex formular inside an arbitrary buffer (see https://emacs.stackexchange.com/a/219/).
A similar question: How to render latex expressions (not necessarily formulae) inside buffer? For example to render something like \textbf{some text...}.
(add-hook 'LaTeX-mode-hook 'turn-on-tex-macros)with no effect.(require 'tex-fold) (add-hook 'LaTeX-mode-hook 'TeX-fold-mode)in .emacs thenM-x TeX-fold-buffercan do what I was looking for. (Note the command isM-x TeX-fold-buffernotM-x tex-fold-buffer).