I have the Wi-Fi only version and after spending 45 minutes on a FaceTime call mine was noticeably hot even through the case. Doesn't bother me though. Situations like that should not happen often enough to make it a problem.
The new iPad is a Microwave, and your hands are the meal! Remember this is the same company that put the antenna where you could touch it and interfere with the signal. I am sure customer safety is right up there with worker safety.
My hands are really sore already... of course it could be the crutches I have been using all day and not the iPad.