So I went to the Apple store to do some temperate tests. I used the CPUtest application to max out CPU usage and read the temperatures and fan speeds. I tested two 15 inch models, one 13 inch model, and my personal 15 inch C2D model. For my results "idle" will represent the idle temperatures, "spike" will represent what the CPU spiked to at full load, and "sustained" will represent what the temperature dropped to with maximum fans.
My 15", 2.33Ghz C2D: Idle: 115 degrees, Spike: 210 degrees, Sustained: 200 degrees
13" i7: Idle: 115 degrees, Spike: 200 degrees, Sustained: 175 degrees
15" 2.0Ghz: Idle: 110 degrees, Spike: 185 degrees, Sustained: 170 degrees
15" 2.3Ghz: Idle: 110 degrees, Spike: 185 degrees, Sustained: 170 degrees
Overall, the 13" was the hottest, but none tested were as hot as my late-2006 MBP. Based on the results I saw at the store, there is not a immanent heat crisis with these MBP's. Comments please