Today I am happy to announce that you can find the source for TextMate 2 on GitHub.
I’ve always wanted to allow end-users to tinker with their environment, my ability to do this is what got me excited about programming in the first place, and it is why I created the bundles concept, but there are limits to how much a bundle can do, and with the still growing user base, I think the best move forward is to open source the program.
Update (2012-08-12): Chris Foresman interviews Allan Odgaard:
My motivation is and always was to create a great editor. If I find something better that fills my needs, I will switch to that—but I doubt it [will happen]. I will continue using and working on TextMate for as long as I am a Mac user.
On the other hand, though work is ongoing, it doesn’t sound like TextMate 2.0 is very close to being completed.