Quick question for Arsenal fans. Do you guys think Wenger knew all along that Cesc would leave this summer and bought Gervinho with the intention of switching to a 4-4-2? Gervinho would definitely fit best as a striker if he played for Arsenal and I don't see Wenger spending that kind of money to put someone on the bench (Walcott, Arshavin, and Nasri--Mata if Nasri leaves--would start on the wing over him, and Van Persie would of course start at striker over him). So maybe he knew Cesc would leave and decided that Arsenal would switch to a 4-4-2, with Gervinho and Van Persie up top, Walcott and Nasri (or Mata) on the wings, Song as the holding midfielder (Diaby as a back-up), and Wilshere as the CM (Ramsey as a back-up). This is wild speculation and I haven't heard anything about Arsenal's friendlies this season or what formation they've played, so I realize I'm probably wrong, but it's just a thought.
I have a feeling he'll stick with the 4-5-1, sell Nasri and Fabregas and put Gervinho on the wing with Ramsey playing as the CM (or Wilshere at times). I hope not, and if that happens they should definitely buy a steely, ball-winning DM with good distribution to support the playmaking CM, since Ramsey or Wilshere are not quite ready to fill Cesc's shoes yet. A midfield trio of Song, Wilshere, and Ramsey might not be good enough. If this happens without a good DM brought in I don't know if they'll be able to stay in the top 4 (I think Liverpool will be great this season). Of course they'd make tons of money with the Nasri and Fabregas sales, and if they did stay in the top 4 it'd be a testament to how great a manager Wenger is and that it is possible to succeed in the Prem on a negative transfer budget. But this season I think it's risky to try and prove that point.