On the new MBPs, the heatpipe was rearranged and flipped over, it's now between the logic board and the keyboard, instead of the logic board and your lap. The keys make a fairly good insultator and keep your hands clear of the metal....just don't touch the metal between the keyboard and the screen.....especially right above F3. It also gets a little warm by the vent, but not too bad unless you are wearing shorts (or a miniskirt, I guess. I wouldn't know)
On a related note, this flipped over heatsink/fan plus the new "user-detachable" bottom plate makes dusting the fans a whole heckuva lot easier.