Arsenal would want 20-25m imo, they'd probably rather keep him for his final year than lose him for 15. He's worth more to them for a season than 15m - if he continues to play like he has done, that is.
although i know what you mean, i'm not so sure about that. he's been pretty damn consistent this year, and arsenal are still nowhere near challenging for anything, really.
i think his future depends on their summer buys, and if i was him i wouldn't be saying anything to anyone about next season.
i see him going to city tbh, mainly cos they'll offer a lot more than he's worth (contract-wise).
also, they're trying their best to turn into arsenal anyway; Platt, Marwood, Vieira, Adebayor, Clichy, Toure, Nasri (and probably more i've forgotten) so one more wouldn't come as a surprise.
plus, they'll need to replace kettleneck, and who better than a tried and tested forward in this league?