Flex 4, codenamed Gumbo, is now beginning active development. The product plan is not yet complete, but a few themes are under consideration:

• Design in Mind: provide a framework meant for continuous collaboration between designer and developer. Probably involves an additional component model that integrates with the existing Halo components.
• Accelerated Development: take application development from concept to reality quickly. Features could include application templates, architectural framework integration, binding improvements.
• Horizontal Platform Improvements: features that benefit all application and user types. Features could include compiler performance, language enhancements, BiDi components, enhanced text.
• Broadening Horizons: expand the range of applications and use-cases that can leverage Flex. Features could include finding a way to make the framework lighter, supporting more deployment runtimes, runtime MXML.

Milestones

These milestones are very much a work in progress:

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Source URL: opensource.adobe.com/wiki/display/flexsdk/Flex+4