No value anywhere here is there really.
You can't even look at BTTS because due to Wigans midweek defeat we don't know what sort of Team Martinez will put out because Wigan midweek fixture against Arsenal for them has become a lot more important than this match.
On the other hand Wigan fans (and I know a lot of them) are really looking forward to this game so Martinez has a fine balancing act to do.
Should City win then I don't see it being more than two or three goals as during this comp they have took their foot off the gas against struggling teams once they have had a comfortable lead out of respect but on the other hand should Wigan win then I can't see it being by more than a goal, I'm saying that because Wigan are a decent outfit who like to play football and a big pitch like Wembley will suit them, talking of which it also seems to suit Yaya who (touch wood) has always shone at Wembley so If you can spot any 'Man of the match' bet's (I've had a look and can't find anyting) then it might be worth taking.