It just seems strange that although the picture speaks for itself, Im wondering if it is legit from the iPad and not pulled from the SDK or manipulated in some other way.
At least he could have said in the comments why or how he got it to that point. Apple warns against people letting these lay about in a hot car in summer, as no electronics should do, but just to be safe, place all iPads in protective sleeves that completely cover their surface and at least away from direct sunlight. Personally its common sense to me.
I also find it hard to believe this came from just normal use, many people have been using them all day with doing various things on them and this is the only screenshot I see with this warning, or its a DOA unit from Apple which should be under warranty.