It's doubtful that he'll even play though, i personally think it's more of Wenger trying to 'scare' Guardiola by threatening to play a striker who isn't anywhere near fit.
Fabregas and Wilshere are definitely expected to play though, and I think those odds on a Barcelona win are quite unfair to Arsenal, especially when Puyol and Pique aren't playing. I've heard that Abidal and Busquets will start in defence.
One question before putting money on Arsenal. Am I betting on the match result, or who will go through on aggregate (because there's been two legs).