It's a tough one to predict.
On the one hand Wenger is pretty stubborn and sticks to his principles. Plus they're competing in the Champions League and need to get top four.
On the other hand, I think he dislikes City intensely for what we're doing, and would like nothing better than to knock us out of a cup.
I think being at home gives him a better chance of dong so, and can see him playing a fairly strong, albeit not full strength, team.
For what it's worth, I think we'll do the same.