HtmlUnit-1.1-pre5 has been released.
The full change log is at http://htmlunit.sourceforge.net/changes.html
Big changes that you should be aware of are:
1) The entire directory structure has been redesigned. Code in cvs is now stored in the "htmlunit" module
2) The jars files used by HtmlUnit have changed. It is now using NekoHTML instead of JTidy