Re: Ten rings to rule them all...
I was talking bout it in the tattoo thread but I hope they do nothing for most of the movie. It just seems like too much. Have him be the puppet master of these terrorist organizations brought together under one banner (Ten Rings) for most of the movie. Then as his last beat in IM3 he gets his hands on tech from the Chitauri to set up IM4. It would be two really different and cool ways to use him and set him up to be Ironman's greatest foe. Ironman doesn't have much of a rouge's gallery so spreading Mandarin over two films would be a smart move to me.
The contrast of this shadowy character leading a whole group and him being on his own & ultra-powerful would be great to see unfold.