I'm not worried about heat dissipation, although a cooler case should mean you're either moving a higher volume of air through the case, or your components aren't getting that hot (assuming similarly-tight packaging). My main concern is power usage. I hope these consoles aren't drawing a lot of power while in standby, as I like to keep my machine in that mode, and don't fancy running up a higher-than-necessary electric bill should I take an extended holiday. I look forward to those measurements, once retail units are finally in homes.