|Image from willson electronics|
From both sites:
"Details about the iPad 3 are very thin yet pundits seem to have reached a consensus on a core set of improvements for the new tablet. A high-resolution Retina Display is hot-tipped for the iPad 3, doubling the current iPad's resolution to 2048-by-1536. While production has reportedly begun for the display, some argue the improved screen could make the iPad 3 slightly thicker -- though it would be unusual of Apple to launch a new product that’s thicker than the older version.""
Links to Wilson and PCWorld