What sets this apart from the other WebKit-based text editors, LightTable and Brackets? In general it seems like there's been an explosion of new text editors with this style since TextMate went into hibernation around 2008. It's great to have options, but there's lots of these TextMate clones now.
TextMate is still alive: https://github.com/textmate/textmate
But to your main point, I would assume this has really really really good github integration...