The alleged ribbon cable of the iPad 5 has been leaked, and the part where the home key goes is rather different than the flex cable we have on the iPad 4, indicating a possible new home button with the venerable Touch ID sensor might make its way on the iPad 5, too...
Source: http://www.phonearena.com/news/Apple-iPad-5-ribbon-cable-appears-indicating-a-Touch-ID-fingerprint-unlock-is-in-store_id48069
Source: http://www.phonearena.com/news/Apple-iPad-5-ribbon-cable-appears-indicating-a-Touch-ID-fingerprint-unlock-is-in-store_id48069