I recently purchased a new 13" pro, upgraded to the top processor. I installed Bootcamp and played hours of The Witcher 3 (on low settings, of course, but still). There were no overheating issues. Fan was going full blast the whole time, but it kept up just fine. Hopefully my little anecdote instills a little confidence. The new 13" is as close to a perfect machine to me as I have ever owned. It's compact, portable, light but a completely full powered functional 100% dev workhorse (with a great keyboard AND a physical escape key to boot). I couldn't be happier. Kudos to Apple for this one.
