Just how much thinner than the current iPad 4? Well, a leaked picture of the iPad 5 thickness measured with a digital instrument shows the impressive 7.35mm, which rates it third of all tablets, after the Xperia Tablet Z with its 6.9mm, and the iPad mini itself with 7.2mm. In comparison, the iPad 4 is 9.4mm, which is about the girth of some thin Windows 8 slates like the Sony Vaio Tap 11...
Source: http://www.phonearena.com/news/Apple-iPad-5-to-be-just-7.35-mm-thin-making-it-third-of-all-tablets_id48440
Source: http://www.phonearena.com/news/Apple-iPad-5-to-be-just-7.35-mm-thin-making-it-third-of-all-tablets_id48440