My biggest disappointment is the heating up of the bottom corners of my iPad. Is this happening to your new iPad?

This is going to vary depending on how the battery is discharging or recharging! Most people with a case won't even know that it is happening.

I don't use a case, and hopefully the heat will go away, because My hand is getting hot...

1 hour of use...

I'm currently charging, so maybe it's hit while charging?

LOL for real? Mine heats up during normal Internet browsing

i boilded an egg off mine...

After i activated the verizon account, i watched a one hour video over wifi with the cellular radio still on. Suddenly, my whole screen changed to "temperature warning...ipad must cool down before you can continue using it." it shocked me because that is a first, never had that ever on the ipad 2. Then the screen went black. I immediately pressed the home button, and slid to unlock, and it came right back on. It stayed warm, i left it in the cover it is in. And so far it hasnt happened again. But apparently Apple knows this can get hot because there is a warning that can show up. Did some looking and apparently the ipad 2 also could produce that warning but i never saw it nor felt heat on the 2. This new one definitely gets warm on mid to lower left side.

The heat will go away. Mine was very hot , the first day...after it cooled it never got that hot again.

Haven't noticed.... But I do have a case.

Yes, my iPad 3 heats up excessively. The first one I received had a big speck of dust under the screen and they replaced it. But both my current and previous iPad 3's heated up excessively. Specifically, in the back side's bottom left corner then the heat radiates across the entire back of the iPad.

Folks - here is the test... Put your iPad on full brightness and interact with your iPad for at least 5-10 minutes. Interaction includes surfing to game playing. Please report your findings on this thread to help figure out if this is a mainstream excessive heat problem for all iPad 3's or if the heat is an indicator of a bad iPad that needs to be exchanged.

Yep. I have the iPad 2 & iPad 3. iPad 3 gets hot lower left corners. After hour or so of gameplay. Thats at
100% brightness. Turn down the brightness and the heat problem goes away. Must be something to do with
the new display and power being drawn.

Never had any issues so far. Mine is in a case as well.

Yes. Since I got it out of the box, dl and install from iCloud made it work the hardest so that was the worst. Off and on it heats up, then cools on it's own. Never had this problem with ipad2, just with iPad HD.

I have the wifi version and use it for several hours at a time. No noticeable overheating.

Mine got very hot the first time I charged it. Even felt the heat through the cover. After that....no problem. It's now on its second charge and isn't even warm. Played x-plane-9 for 10 minutes but it only got very slightly warm.....and that was touching it directly.

I second this finding. I only felt the heat on the first day and never again afterward.