I don't know if there is any beta tester around, but I am sure they are not supposed to even say that they are beta testers... The last NDA that I signed said that at least...
My guess is that you will still have an option to use AS1, AS2 and AS3 cuz they are not introducing AS4 yet... Besides that, Flash is trying to provide backward compatibility as much as they can, so I don't see any reason why they choose to take out AS1 or AS2 support... That's my 2 cents...