I was browsing around the Sencha site this morning and saw that they announced the beta release of 3.3 which includes two major new components:

While those will garner much attention, the ugly stepchild mentioned at the bottom of the press release is also very cool. The ActionColumn allows you to put icons inside a grid with an accompanying event handler.

This is something we use quite a bit in Flex, and its addition to ExtJS is exciting.