Huh? Kuo was way off here. Imacs always follow the macbook pros unless notebook parts don't come out until way later. I'm not sure you'll find the imac update that interesting. They might make engineering tweaks of some sort, but the processor speed increase won't be significant,
Depending upon the route Apple takes with the desktop machines we could see a strong CPU performance increase from higher clock rates. With so many variants of the Haswell chip and its GPU options it is hard to say for sure what Apple will put in the iMac. If the put a Haswell in the iMac with a high performance integrated GPU we might see a regression in CPU performance. If on the other hand Apple goes with one of the lesser Haswell GPUs supported by a discrete GPU we could see a performance gain. On top of all of that Intel will apparently market Haswell chips with no integrated GPU at all.
So who really knows.
The only other things that would make the iMac interesting is TB 2 support, accessibility improvements and a move to SSD only support. I can actually see TB 2 and SSD support as possible with accessibility (to the SSD and other wear parts) being wishful thinking. Even if iMacs only improvement this go around was the SSD stick from the Mac Pro it would be a significant improvement to the machine. As to GPU cards well that is interesting too as I thought AMD had "new" cards coming this fall. New cards being basically relabels for this year.
Now is that interesting? I don't know, I guess it depends upon the user. In any event I don't have a problem with what is in the machine but rather how you get to it, I just see the current iMac design as more of a joke than anything.