Adobe released Flash Player 10.1 Release Candidate, you can grab it over here for Windows, Mac OS X and Linux.
This is a developer prerelease version of the Adobe® Flash® Player 10.1 software for Windows, Macintosh, Linux, and Solaris. It is being made available for developers to test their content to ensure new features function as expected, existing content plays back correctly, and there are no compatibility issues. Consumers can try the prerelease of Flash Player 10.1 to preview hardware acceleration of video on supported Windows PCs and x86-based netbooks. The Flash Player 10.1 prerelease is available in all supported languages; however, the prerelease installers are only in English and we can only accept feedback in English at this time. Release versions of Flash Player are available from the Flash Player Download Center on Adobe.com.