Nope, Flash still uses the browser's timing, which for some reason doesn't allow Flash to run at 30 fps, which most games use. Unless you re-time the thing manually like I do, but that eats up idle cycles (which, who cares, if you're playing a Flash game it should take up as much CPU as it needs to for a smooth game). Far as I know, I'm the only one who does this, though.
Oh, and support isn't coming for any other GPUs, because the API isn't OpenCL, it's an API for special hardware accelerators only on Nvidia GPUs.
Which, personally, I believe is the exact opposite of what Apple is trying to accomplish with OpenCL.
So basically, Flash is always going to run terribly, unless Adobe starts rendering the vectors with OpenCL, or buys Scaleform to get all the code and graphics to run natively (and anyone who complains how ugly anything made with Flash is should probably look into Scaleform and see where Flash interfaces have been used).