I think Djourou had his wage increased up to 50k with his new contract and Chamakh is around the 60k mark IIRC. Podolski alone is probably going to be 80-90k. Even though Giroud isn't on much at Montpellier (read somewhere only 15k but surely that is wrong) we'll probably bump him up to around 50k. Looking at an increase of around 20k maybe but the quality of players make us better off.
He didnt get new contract. There was only a clause in his current one that it can be extended on same terms for another year if he wanted to.
You forget Almunia who's gone now and freed around 60k wages per week.
I think we might see quite sizeable decrease in wages if we manage to offload everyone even if we sign couple new players and renew RVP, Song and Walcott. Hopefully wages to revenue can be lowered below 50%.