Item Selection

This pop-up screen, the Item Selection screen, was shown on a released picture during the PAX Prime (Aug 26th - 28th 2011). It apparently looks like a selection screen for the upcoming Creative mode.

There are more of these photos here: http://www.minecraftforum.net/topic/578249-pax-party/

Trivia

 * Non-legitimately blocks are seen on the screen, such as sign blocks.
 * New blocks, such as watermelons and possibly smooth stone stairs can be seen.