On the EllisLabs site there's a recent post talking about some of the big changes that've happened to their development process surrounding CodeIgniter and its future version.

EllisLab today announces changes to our internal development processes, including dropping Subversion in favor of Mercurial and adopting Assembla as our agile software development management tool. Along with these changes, CodeIgniter 2.0 pre-release code is in development, and is now hosted at the Mercurial-focused social coding site BitBucket.

They also talk about their move to the Scrum method of software development and how this (and their change of version control system) can help the future of CodeIgniter (version 2.0) come even sonoer through contributed updates and bugfixes made much simpler through the features of BitBucket (similar to Github). If you'd like to contribute, you can follow the CodeIgniter project and get busy contributing back to this great framework.