According to The Guardian, the iPad HD (iPad 3) may feature Senseg e-sense technology, which can give "texture to a touchscreen"
http://www.guardian.co.uk/technology/2012/mar/06/apple-touch-new-market-ipad-hd
This might explain why the iPad HD is ~1mm thicker than the iPad 2. And Apple's "... something you'll want to see. And touch." teaser.
http://www.guardian.co.uk/technology/2012/mar/06/apple-touch-new-market-ipad-hd
This might explain why the iPad HD is ~1mm thicker than the iPad 2. And Apple's "... something you'll want to see. And touch." teaser.