Today sencha announced ExtJS 5 public beta version. ExtJS 5 comes with lots of new features and improvements. New features in ExtJS 5 is like new themes(Crisp) and tablet support with neptune touch theme, support for MVVM(Model-View-ViewModel), View Controllers to apply logic application wide from instantiation to destruction, View Model for notifying whenever data changes, Formulas to calculate data from other data, Routing to implement “deep linking” within application, Associations for declaring associations by adding a “reference” config, Chained Stores, Heterogeneous Stores etc.
To know more about new features of ExtJS 5 visit here
To view ExtJS 5 examples visit here