New pics showing that it's slightly thicker than iPad 2 and the more tapered form factor.
MicGadget.com's round-up






MicGadget.com's round-up
Notable differences include a 1mm-1.5mm thicker design, depending on where on the iPad 3 you are measuring. Also, more tapering is shown. This will likely make the iPad 3 feel thinner than the iPad 2 while being held. While not visible in the images, the report claims the iPad 3 bezel will be slightly narrower than the iPad 2′s bezel.
The unit is about 1-1.5mm thicker depending on your model. Also it does fit inside some iPad 2 cases despite this.
The capacity our sources have said will stay the same, at 16GB, 32GB and 64GB respectively.
LTE has been tested, but the market is limited, so perhaps we will not see anything outside of 3G connectivity.