I would miss my family and friends loads - it would be weird not being able to contact them, if you are away from home, at least you know they are okay by using fone or woteva but in there, its doors shut and you mite not see them for the next 9 weeks, I couldnt cope with that!
On a less serious note, I would miss TV, partying, junk food like Maccie D's, my Mums cooking and just being able to do stuff without a camera watching you 24:7.