Oh for christs sake. Not another one
No laptop runs 'too hot' They are all built to within specific design tolerances and have inbuilt protection systems that turn themselves off if you exceed the maximum allowed tolerances.
Buy it and enjoy it..and stop worrying about whether it's going to 'get hot' if your gaming it's generally going to be on a desk of some sort, so I really wouldn't worry about it.
Even if it does get 'too hot to the touch' in the upper left hand corner, all it actually means is your macbooks case is doing what it's supposed to rather well, which is dissapate the heat from the processor and gpu.