Under regular use (web, pages, mail, etc.) it is cool. Add a few more things and it warms up. Run a Hulu video and it gets toasty, with the fan coming on, and my palms sweating. I don't know if it is cooler than the 2011, but it is definitely not a "cool" computer, in my opinion.
This isn't a complaint. Just an observation. It does pretty much what I expected it to do. I would have been happy with a cool computer too. But, that's OK. Maybe next year 🙂