http://blog.macromates.com/2009/working-on-it/
This really reminds me of a series of blog posts by Chad Fowler, warning against the "big rewrite."
http://chadfowler.com/2006/12/27/the-big-rewrite
Now he says the next version will be out "maybe in 6 more months if everything goes right." In other words: "I have absolutely no idea when or if I'm ever going to finish it."
Which, of course, is fine. It's his project and he has every right to develop/mismanage it as he sees fit. But I got tired of waiting for basic things like split-window to be implemented and went back to vim a while ago. If 2.0 ever comes out I'll definitely check it out but for now I'm happily using vim.