Anecdotal suspicions that the new iPad operated at a noticeably higher temperature than the iPad 2 have been backed up now that someone has pointed an infrared camera at the thing to see what's up. After running GLBenchmark for five minutes, the new iPad ended up being much hotter than the iPad 2 - 33.6 degrees Celsius versus 28.3 degrees Celsius. The processor is likely to be the source of the additional heat, particularly the additional graphics processing units in this model.
The extra heat isn't getting to the point where new iPads are shutting down, but I would be worried about using it for an extended period of time on a hot day. Considering the new iPad is only marginally thicker than the last iPad, and they're cramming a whole lot more battery and processing power in there, it's no surprise that things are getting a little toasty inside the new iPad.
Have you been having issues with heat? Be sure to let us know about your experience with the new iPad's temperature in the forums!
Update: Apple has issued a statement on the issue to The Loop:
The new iPad delivers a stunning Retina display, A5X chip, support for 4G LTE plus 10 hours of battery life, all while operating well within our thermal specifications,” Apple representative Trudy Muller, told The Loop. “If customers have any concerns they should contact AppleCare.