As we had predicted it, our friends from Kodovarisan have fully disassembled the new iMacIntel. Beside the motherboard, the remaining parts and components of this iMac are really similar to the iMacG5 rev2.
One can notice that the processor is not soldered to the motherboard, but via a socket. So, it will be potentially possible to change it in the future, if Apple does not prevent such modifications by some hardware or software trick. http://www.kodawarisan.com