I'd really like to see the 2.6 extreme go into the new iMacs. At the slight power consumption increase, that shouldn't mean much to a desktop or much in the way of heat. It would be nice to see these in 24" iMacs, at least as a BTO option, only problem is that if they are not pin-compatible to the SR C2Ds, then they can't offer 2.2 base and 2.4, 2.6 options. However, if they can ideally we would see:
20"iMac
2.2Ghz SR maybe with 2.4 option
24"iMac
2.4Ghz SR with 2.6Ghz Extreme option
and don't hold your breath, but a
27"iMac
same 2.4Ghz SR with 2.6Ghz Extreme options would be awesome.