1) Multi sorting and filtering on Data Stores
Multiple filtering has been possible for quite some time thanks to the GridFilter Plugin but multiple sorting is new. The demo shows the use of a Toolbar Droppable plugin too. Nice !
2) Animated DataView transitions
Think better looking product catalogs ;-)
3) Composite Fields
I've always wondered how to get the datefield and the timefield components in one line.
4) Slider and Slider Field
Multiple handles in one slide bar and the ability to use it as an alternative input field to say a numberfield.
5) Toolbar plugins
We saw the droppable toolbar plugin in the sorting demo. Seems you can reorder toolbar items now as well.
6) New Theme
A new theme has been created that makes your app compliant with the Section 508 of the Disabilities Act.
7) Unit Tests and lots of it.
Almost 300 test cases. Wow !
Grab the beta from Extjs.com