Spotted this because it one of the demonstrated uses was with wikimarkup. How useful it actually is or is not is a different question.

"Writing documents using markup languages isn't always easy. Take Wikipedia, for example: one often needs time to relocate the current focus when they switch between previewing and editing mode. Now with Gliimpse, one can watch the markup code gradually turn into the rendered result. The demonstration on Youtube simply looks amazing, and shows that the software supports many markup languages, including LaTex Mathematics."

http://tech.slashdot.org/story/12/03/25/1322252/animating-from-markup-code-t... http://www.youtube.com/watch?v=hG3ELslkHDY&feature=youtu.be http://www.aviz.fr/gliimpse/

They have a working demo written in java, by the look opf things.