According to bugzilla.mozilla.org,
On Tuesday, December 26, at 6pm PST (2am UTC) we will be upgrading Bugzilla to the current pre-release of version 3.0. We are expecting the upgrade to take anywhere from 4 to 6 hours. Bugzilla will be down for the duration of the upgrade process. For more information, see the upgrade notes.
Freakin’ sweet! For those of you who haven’t seen it, Bugzilla 3 looks quite different from version 2. You can test it at bugzilla-test.mozilla.org