Someone on this forum suggested opening a page on your new iPad containing a lot of white space, the new iPad page on the Apple site, for example.
Then place your new iPad on the table beside a sheet of white printing paper. If you have another Apple product, an iPhone, iPod Touch, or an iPad 1 or 2, you can also place them in the row.
Then compare each side by side.
While my new iPad was definitely slightly warmer, it wasn't anything I couldn't accept. Not everyone will have the same result or acceptance level.