The official Adobe Flex 4 Open Source site is currently the best place to find information about this upcoming version of the framework. It's worth noting, however, that Flex 4 is still in development, and they don't even consider it beta yet. This could change significantly between now and the final release.
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官方 Adobe Flex 4 开源网站是目前查找信息的最佳位置关于即将推出的框架版本。 然而值得注意的是，Flex 4 仍在开发中，他们甚至不认为它是测试版。 从现在到最终版本，这可能会发生重大变化。
更新：
Beta 1 于 2009 年 6 月 1 日发布。
The official Adobe Flex 4 Open Source site is currently the best place to find information about this upcoming version of the framework. It's worth noting, however, that Flex 4 is still in development, and they don't even consider it beta yet. This could change significantly between now and the final release.
UPDATE:
Beta 1 released 1 June 2009.