Take it back to the vendor while it's in warranty.
Hi i have the same problem.
I ran some tests and did some research. It turns out that this problem is both software and hardware related.
On youtube there are developers who are already manufacturing a bottom case lid for the macbook pro,providing a better air flow and reduces the temperature slightly also many customers are complaining that the new OS Mavericks heats up the computers a few degrees than normal (noticable but not vast).
As a gamer a 2GB graphics card should work on most games with the settings set to medium at 1080p. The mac book display is much higher and the graphics card finds it difficult to render some games on the 2800p, so when you start a game set the settings to a appropriate degree for a more smooth performance.
The first test i did was play a browser game. The first time was very hot, i did some research and reseted the SMC or somthin, then i tried it again and it was ok, not that much heat.
Then i played Skyrim on the mac book but i could not change the settings so it was at 2800p, the laptop was soo hot it reached 150 degrees, from a typical temperature the fans made a noisier sound than the speakers. i think that the problem is somewhere in the process of knowing when to switch the built in Iris graphics with the dedicated graphics when running a game.
I had a previous laptop which overheated and burned my fingers at very high temperatures when running games.
If this problem persists then take it back to the apple store as soon as possible also contact the team about this problem.
Lastly i think that for a price of £2.2k there should not be any problems with this laptop watsoever.