It has to be in the standard model/s...
I doubt apple will allow MBP to have i7 on 5 out of 6 models and not include it in the iMac as standard. I would even bet on having it as standard on the smaller one (21.5" if they'll keep the screen size 😉 )
If it is correct what they say about "Sandy" less heat, power consumption and better performance for similar price I think new iMacs will get significant boost this spring...