1st post so be gentle. I think the current squad/backroom staff bare to many mental scares (AC Milan/Man U games in recent history) and a steady clearout is probably needed. I'd probably keep ramsey/song/sagna/kos/TV/Wiltshere/RVP/szchezny/oxo (although i'd expect him to leave in the summer) and maybe gervinho. I was very impressed by Hummels the Dortmund CB when we played them, seemed commanding and i'd like to think attainable. I'd like to see Wenger bring a new assistant like Keown or Bould with the view to potentially taking over the reigns and have the defensive "know-how" we clearly need.
I agree with you about Hummels, he's world class. There's a reason Mertesacker has lost his place in the german team, Hummels is that reason. I have to disagree with keeping Song. I've been saying this for ages, he's not good enough. He's a holding midfielder that can't hold, that's almost as bad as a striker who can't score. Yann M'Vila, Ettiene Capoue, Sven Bender are all far better than him.