In my yesterday's article on the iPad 3 / 4 Retina-friendly version of the great and, unfortunately, “thanks” to Apple's - when it comes to hardware video acceleration - absolutely unnecessary AppStore-approval restrictions, jailbreak-only XBMC, I've mentioned it still doesn't support external screens via a wired (HDMI or VGA) connection. (Decent AirPlay isn't supported either, so you can forget streaming video wirelessly from your iDevice. Only cabled solutions are workable.)