Does the new class definition pipeline and mixins of Ext JS 4 going to be part of Ext Core?
It seems that if Ext Core had a little more features, it could start to be a contender for competitor like JQuery.
See:
http://www.sencha.com/blog/countdown...-class-system/
http://edspencer.net/2011/01/ext-js-...-pipeline.html
http://edspencer.net/2011/01/classes...-the-hood.html