Adobe has release Adobe Flash Player 10.1 beta 2 debug version of the flash player as a developer prerelease. You can download it from Adobe Labs: http://labs.adobe.com/downloads/flashplayer10.html. This version is available for Windows, Mac OS and Linux. This is a great news because we’ve been waiting for a debug version of FP 10.1 since it has been made available as prerelease.
No Flash CS5 Public Beta
A public beta of Flash CS5 was announced at Adobe MAX 2009, but Adrian Ludwig (Group Manager, Flash Platform Product Marketing at Adobe Systems) announced on the Flash Platform Blog that unfortunately there won’t be time for a beta. Bummer.