I'll go and grab this when I can afford it, I hope they fixed the brushes in this one since CS5's were so shitty. Also it would just be plain retarded for them to ditch AS3, so it should be a given for them to stick with it, since they've already invested so much time in it, and companies like Unreal are now having their products like UDK export to Flash using either Flex or AS3, either way both are basically the same.
It's also a possibility that this features absolutely nothing new and Adobe just want's some more money, since they tend to do that. Has there really been any major differences from Flash 8 up to CS5? Maybe some UI changes and some new features, but that's about it. Those should come free if you own any version of Flash. Maybe then they'd have somewhat respect as a company.