It was 106 degrees in Phoenix, AZ today. I found myself standing on top of a rock faced mountain overlooking most of the city. Had a set of lenses, 2 64GB 1000X Komputerbay cards, and a slew of batteries...
The camera showed the "overheating" indicator on-screen quite-a-lot. However, the camera did not power off. I used to own a 550D and that camera would automatically shut down after about 10 minutes in direct sunlight. I carried a large white towel to utilize the Canon's display in direct sunlight as well as to protect and keep the camera cool when moving from shot to shot. In the end, the camera did not automatically turn off, not once.
It was reliable enough to set the camera to raw_record, start/leave the recording, climb the last 30 feet of a mountain, and grab a hero shot!
Say, if you haven't used MagicRAW beta 6 from Thomas Worth I highly recommend downloading this beta. Files are spanning perfectly. Here is a link to beta 7...
http://www.mediafire.com/download/ht3ydb4s254ka5z/RAWMagic-beta7a.dmg. I imagine it's only better than beta 6.