What are you doing on it when it overheats? And what do you consider overheating, what temp is it?
If was really overheating it would shut down. Has it shut down? If not then it has not really overheated. Its just gotten hot.
You have 14 days to return it for Full Refund, No Questions Asked. So if it continues to, what you call, overheat take it back and get another.
The hottest I got was 98C
That is abnormal, perform a Hardware Test and see what it is so you also tell that to the Genius Folks.
Could be a dead sensor or fan I'm guessing, you'll see if it turns up anything.
And you have a new machine, SMCfancontol likely hasn't been updated for it, I also agree it should be uninstalled prior to return.
3: Hardware Test
Category: Hardware only related
Description: Apple's Hardware Test, does a internal investigation for hardware related issues.
For those machine that have it, you need to have a Internet connection and hold the D key down for quite some time while rebooting to load it from Apple's servers.
If it gives anything, write it down and consider taking it in for service.
Find the closest Apple repair or distributor: https://support.apple.com/kb/HT1434