- I HOPE for an aesthetic change, in order to improve the crappy thermal properties of the ultra-thinny-edges-case to a level which doesn't require thermal throttling of the MOBILE parts in this desktop computer…
It is actually a good design from a thermal perspective with the entire back acting to dissipate heat. I'm using a 27" late-2013 iMac and play demanding games on it but never run into issues with heat unlike the mid-2011 iMac this one replaced under Applecare. I've found performance to be quite good for the GPU in the games I'm playing, currently Max Payne 3 at 1440p and high settings across the board. It's running consistently around 60 fps and very smooth. Considering this is a cider port that is especially good in my opinion. I don't think the GPU is throttled on iMacs the way it may be on portables as power draw isn't the same issue which is what that is normally used for, there isn't any need.
I monitor component temps constantly with the Temperature Gauge 4.1 app and they never get too close to upper tolerances on this system. Meantime, performance is not suffering either under demand. So I don't think there is a real problem with the design personally. At least, I am not seeing it at all here. This system runs great and I could not be more happy with it for now.
I really like the all in one design. I just buy into Applecare and anything beyond three years is a bonus until it is upgrade time again. That's just my own take.
Back on topic, without a pressing need to get the new iMac I would absolutely wait on the next refresh. Why not? I would expect component upgrades in a number of key areas that would make this more than a little worthwhile.