Clutter 0.4.0 was, finally, released two days ago. Not only the core and add-on libraries but also the language bindings are available for this new stable release cycle.
We already started working on trunk for the 0.5/0.6 development cycle, which should hopefully lead up to another stable release in six months; there already is a nice list of features we are working on, but I’d like to see more requests, more patches ( ;-) ) and people working on even more language bindings.