Testing version of 4.0.1 is accessible from
http://toolkit.itmill.com/testing , please have a look. It contains 14 new demos and source code for all the demos, including feature browser.
Main fixes in 4.0.1 are related to binding keyboard events into Toolkit UI components on Ajax capable terminals. Keybinding allows interacting Toolkit application with your keyboard. We bring also couple minor enhancements to next release, such as modal window.
Most “new features” are considered so small or as bug fixes, e.g. keybinding for UI components for Ajax side (previously worked only on HTML side) that we are still talking of maintenance release.