Trolltech has released the first Beta version of the upcoming Qt 4.0. You can download it from ftp.trolltech.com or from one of its mirrors. An updated online Qt Reference Documentation is also available. The final Qt 4.0 is expected to be released in late first quarter of 2005.
There are five new technologies that are new to Qt, written specifically for Qt 4:
This beta release also previews the new Qt Designer user interface design tool which is still heavily under development.
In addition, the following modules have been significantly improved since Qt 3:
Trolltech has set up a special mailing list, qt4-preview-feedback, for discussion of issues relating to the Qt 4 beta releases.