What is the major difference between the 522 & 721. Is it because of the hd (522 @ 80Gb, 721 @ 120 Gb) and because the 522 can output to 2 different channels to be viewed. Than what was the purpose to release then 721 if it can't output 2 different channels to watch. Will the 522 still use Open Tv (no future at all) or will it have Wink enabled technology?