We are pleased to announce the first release candidate of the 0.5 branches of CEGUI. There has been a lot of changes between 0.4.1 and 0.5.0. They are listed in Release Notes 0.5.X] Please have a try at it and help us get a final release soon by sending a lot of bug report in Mantis bug tracker. The download page for CEGUI-0.5.0-RC1 contains some typos but most link are already valid and mirrored on sourceforge. The link on the download page are going to be fixed during the day.
For any question regarding this release you can use either the forum either irc.