My worry about the addition of the fan is not that the fan per se is bad. I worry that this means the case may need a re-spin or two, and the project could be delayed by many months. I had hoped I'd have a Pyra in my hand by the end of 2017. Now I'm afraid I won't.
We will also add a few venting holes below the USB port. No worries, the mold doesn't need to be changed for that - an inlay for the mold will be created for that.