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The next version of Flex, code name Gumbo, is now in active development. It is has 3 primary themes:

• Design in Mind: provide a framework meant for continuous collaboration between designer and developer.
• Developer Productivity: improve compiler performance and add productivity enhancements to language features like data binding
• Framework Evolution: take advantage of new Flash Player capabilities and add features required by common use-cases

Download builds of Gumbo from here

All detail you could find on adobe site