While the ioquake3 project has been one of the main projects hosted by Icculus.org, the infrastructure offered by Ryan Gordon, they have deprecated his SVN ioquake3 repository. All future development of ioquake3 is now being done with Git rather than SVN and in the process they've moved all the code to GitHub.
The ioquake3 BugZilla and other functionality of the site will remain within Icculus.org, but the code has been moved to GitHub.
The ioquake3 project started nearly seven years ago, in August of 2005. It's going on almost five years since the last official ioquake3 release, but hopefully they will have out something new before hitting that anniversary... Meanwhile, the development of ioDoom (the open-source id Tech 4) is also going very slow even after the code being out in the public domain under the GPL for over one year. At least last month saw an open-source port of Doom 3 BFG to Linux.
The ioquake3 project changes were announced in a Happy New Year post.The GitHub repository is under ioquake.