I haven't really needed any new features, just the better performance, so I haven't dug around too much. A perfectly optimized AIR 2.0 app that uses GPU can perform as well as the same app under AIR 2.7, as it's using the same GPU. So I wouldn't expect dramatic improvements there. Some things were changed, like the use of filters, that will speed up some apps, but then it also would limit you on some features that used to work. Overall, I would try doing no optimizing and use CPU, and only then think about going all out and optimizing for GPU. Incidentally, now that the graphics are faster, all those old web optimizing tricks can apply again. That is, any sprite sheet and blitting tricks you've used will work well under CPU (they still won't help GPU).
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