WordPress developers have released the second beta of their next major update.

WordPress 3.5 Beta 2 is now available for download.

What’s changed since Beta 1?

New workflow for working with image galleries, including drag-and-drop reordering and quick caption editing.
New user interface for setting static front pages for the Reading Settings screen. (#16379)
New image editing API. (#6821)

Plus, they are working on fixing the bugs in this release before it can reach the stable edition.