Bugzilla 4.2.3 is very close, and Bugzilla 4.4rc1 is not too far away
I think now is a good time to give you some news about the current development of Bugzilla. First of all, we are very close from releasing Bugzilla 4.2.3 and 4.3.3. There is one blocker left which needs its patch to be reviewed, and we can start the release process. Hopefully this will happen this week. Both releases will work with Perl 5.16 (uploading attachments was broken due to a change in Perl 5.16), databases created with PostgreSQL will now be encoded with UTF8 (the encoding wasn’t enforced, and was entirely depending on how initdb created template1), Oracle will be able to display buglists again instead of crashing (unless you try to display keywords, flags or tags. I have no idea how to fix this problem, help welcome), the obsolete -moz-border-radius CSS property which was no longer understood by Firefox 13 and newer has been replaced by -border-radius (meaning that other browsers will take advantage of it too), and a regression in 4.2.2 about the keyword auto-completion feature has been fixed. There are a few more fixes included in 4.2.3, but you will read them in the release notes. :)
About 4.3.3, we can also mention that the "Browse" link in the page header and footer now correctly sorts products by classification, you can now save your tabular and graphical reports (till now, you could only save your searches), the User.get WebService method now returns your saved searches too (and only yours!), PATH_INFO is now removed by default from all URLs, graphical reports are automatically resized based on the size of your window, if you type the alias of a bug you cannot see, Bugzilla no longer tells you which bug ID has this alias (it just tells you that this alias is already in use), flags which you cannot set/edit are now hidden instead of being disabled only, there is now a "(take)" link besides the QA contact (till now, only the assignee had such a link), and we now use HMAC-SHA256 to generate tokens instead of MD5. More WebServices methods are expected before 4.4rc1; they are currently being worked on (and some patches already in the review queue).
Once Bugzilla 4.2.3 and 4.3.3 are out (hopefully this week), we will create a branch for 4.4. On the 4.4 branch, we will limit changes to new WebServices methods, bug fixes and some not too invasive patches. The plan is to release 4.4rc1 next month or the month after, and 4.4 final before the end of the year.
On the trunk, we will immediately start the development cycle for Bugzilla 4.6/5.0 (we didn’t decide its version yet, but this is not the most important part of the story). One of the main goals will be to improve its User Interface (yeah, that’s not a joke). We are currently using YUI2, and I hope that using YUI3 or jQuery (the choice isn’t made yet, see bug 453268) will help to reach this goal. We will also need feedback and suggestions from the community to improve things (this is way better than waiting for the next version to be released and start complaining at that time that you don’t like the new UI. Try to be constructive, though). We will also bump the min version of Perl from 5.8.1 to 5.10.1 so that we can use some new features implemented in 5.10.1. New contributors are always welcome! ;)