My Macbook air using low settings runs above 100 fps on sc2

the temperature with my cool pad is usually about 82 - 85 Celcius, don't know the conversion, and without it it goes about 88 - 94 but it does usually peak and then fall to 88ish, you just have to make sure that you don't cover the back of the laptop, and possible use it on a table so the air can flow underneath it.
You say the redesigned mbp will run hotter because its slimmer, while this may yet be the case Ive Bridge will take about 20% off the power consumption because of the new chip set. this could possibly take off some of the temperature.

Plus you get that nice "new laptop" look, hopefully there will be some unexpected perks of the new redesign? better cooling? hah, the difference between the TOP 15" and TOP 17" is a mere 100$ so id consider that. but your right it is a hefty weight to carry UNLESS you waited for the Slimmer version?!?!
My 11inch is my portable so I'm a lil biased i guess, but deff these are profession computers, apple wouldn't put in a good graphics card if it knew it could do any detrimental damage do to over use, they are built to sustain.
Back to the SC2 subject, SC2 unlike I'm sure D3 is that sc relays mainly on CPU and uses a lot of memory, its not a hefty gpu related game, d3 will be quite the opposite. Again, i don't mean to discourage, but Ivy bridge is supposed to bring 30% better graphics abilities regardless, if I'm not mistaken, thus requires less strain on the card and produces again less heat.