GitHub's New Text Editor Atom Leaked But Not Official Yet
|Richard Harris in Programming Wednesday, February 26, 2014|
It looks to use CSS / LESS for highlighting, and CoffeeScript for client-side programming , or the autocompletion.
It doesn't seem to be a fork of either Ace or CodeMirror.
There seems to be Vim shortcuts  and even theming.
There are a few plugins already out for it;
- emmet (aka Zen Coding)
- solarized-dark-syntax (heh)
- snippets (check)
- language-* (check; so many; awesome)
- timecop (tracking where time is spent in the editor)
- editor-stats (graph your mouse / keyboard activity)
Overall there is great expectation for the "official" release of the editor but no word yet on when that might be..
Read more: https://github.com/atom