still, considering this season, those are all players that have been seeing a lot of playing time. I said they subbed in Chamahk but he did get to play. That is definitely a team they could field in the EPL after adding Fab and maybe Arshavin which has probably been your worst player so far.
There's no way I would call that a reserve team however, especially considering Wenger's propensity to play everyone.
Eastmond started instead of Song, Eboue started instead of Sagna, Djourou started instead of Koscielny, Rosicky started instead of Cesc, Theo started instead of Arshavin and Niklas started instead of Chamakh.
The players i mentioned above, would rarely start an EPL game if the opposite player was fit, that is for sure.
The only reason you have this perception that Wenger rotates is because we get so many of those minor injuries, so his hand is actually forced sometimes. But when everyones fit, Wenger is the sort of manager that rarely ever rotates.