It is a home game for Arsenal, which makes this game more interesting than I would otherwise expect. I think a game at Manchester City's would be a much harder task than this one. Arsenal is in great shape to go for it now, but this game also involves some desire for revenge for last season. If Arsenal beats Manchester City, I think it would allow people to dream again that Manchester City won't pull off a one team show this season again.
Both clubs are in top form and it might be quite difficult to comfortably predict the outcome of the game. Arsenal playing at home wouldn’t significantly improve their chances of winning but I guess playing at home has its own advantages.
Arsenal would be hoping to win the game giving Man City the second loss of the season and it won’t be an easy feat as Man City would also be hoping to win and extend their lead. If Arsenal does win, people might just begin to look at the possibility of some other club other than Man City win the league this season. The game would be an interesting one to watch.