Since Adobe has opensourced the Flex SDK, the (codenamed “Gumbo”) are being publicly documented. I’ve been watching this page since it went up on site and just noticed a change last night.
A working document has been added to describe the that are currently being drafted. The syntax changes document contains a few examples of how the code would differ from using states in Flex 2/3 and in Flex 4. Some of the new tags can be seen in the .