My two cents:
We aint getting a centre mid. Arteta, Flamini, Wilshere, Ramsey, Rosicky, Ox and Zelalem will all still be here next season, the first 6 are all pretty much personal favourites of Wenger and they all earn good money. Zelalem will be his pet project. I'm sure Wenger will look at that and think we are more than covered.
I think Wenger will go for one attacking player, who he'll be willing to spend a lot of money on. Could be a striker, could be another attacking midfielder. Then we'll sign a couple of defenders, at least one of whom will probably be a kid. Then a nobody keeper from somewhere and Martinez will be no 2/3.
Dont think we'll sell Podolski or Cazorla or any regular first team player. And I reckon Wenger will try very hard to persuade Vermaelen to stay one more year. Looks like Sagna is definitely off though.