(Infrastructure: Extension, Plugins) YUI 3.0 Preview 2

I don't know if the jQuery UI Dev Team are debating or redoing how
extensions or plugins would work with widgets. Yahoo YUI 3.0 has
something cooking, may help sparks some ideas:
http://yuiblog.com/blog/2008/12/09/yui3pr2-2/
Sincerely,
William Chang