I am currently in the most critical stages of my phd thesis writing (this is why my blogging activity is not so high), but from times to times I “relax” by devoting a bit of time to IzPack 
The next major release will be 4.0.0. There will never be any 3.11.1 as it was meant as an interim release. We are on a short (3 months) release cycle for 4.0.0 and it is expected to be delivered on may 12th.
You can easily follow the roadmap using JIRA. At the moment, here is what we have in the queue (some issues are still open, and new ones will get into!).
Release Notes - IzPack - Version 4.0.0
Bug
- [IZPACK-13] - It appears that the "parsexml" resource attribute support does not read the resource that is to be parsed
- [IZPACK-14] - Language XML file contains "rdid" (not "txt")
- [IZPACK-15] - The <xinclude> directive does not work when trying include relative resources where the compile is not run from the same directory as the installation file.
- [IZPACK-16] - Some panels are displayed although suitable conditions are not met
- [IZPACK-19] - The launched installer hangs even if the jar installation would succeed
- [IZPACK-20] - The launcher will never prompt you to install a JRE if there is no JRE on the system
Improvement
- [IZPACK-11] - Option for writing installation information
- [IZPACK-12] - Target Java 5 instead of Java 1.4
- [IZPACK-22] - Update of the Hungarian translation
New Feature
- [IZPACK-10] - Single Instance
Task
- [IZPACK-17] - Finnish translation is not updated.
- [IZPACK-21] - Bundle the native launcher in the IzPack installer ‘utilities’ pack.
- [IZPACK-23] - Update the project URL references in files
Wish
- [IZPACK-18] - Should there be component for translations?
This list is a simple copy and paste from JIRA. This will be our first real release from Codehaus, and also our first one using JIRA.
I must say that I am really impressed by the tool! As a project manager, it makes my life really easier. And as a developer, it doesn’t get into my way, but helps me make tidy work. I highly recommend it, but if money is an issue, Trac is also very good.