Reworked access control to be a plugin. This will have the beneficial effect of drastically reducing Views load during menu access checks.

Major re-organization of handlers. PLEASE NOTE: This drastically affected the Views module API and until modules are updated to match, they will stop working. Efforts have been made to ensure that this won't cause your site to crash, but that's partly up to the individual module as well.

Fix argument validator so that access() is handled properly like it is on the default argument type.

Change the update button to "update default display" when you are changing values on the default display.

#274341 by mooffie: Check for the presence of template files so that we can tell if a template got renamed but theme registry was not cleared.

#270920 by mooffie: Add checkbox to feed displays to allow use of the site name for the feed title, in order to better duplicate the basic Drupal rss.xml capability.

#270892 by aclight (expanded by me): put default action and validator options in a fieldset to make the form less confusing.

Revamped export functionality. This is a less verbose export that takes advantage of the newer options/defaults system so that it does not have to export quite as much data. Also a tool to export multiple views simultaneously.

Blocks should recuse themselves if they have no results, no empty text, and "even empty" is not set for the style plugin.

Modify $view to only use handlers for the field items, since it cares a lot more about the handlers than it cares about the actual storage of the field items. This could have implications for modules, particularly date and calendar.