I think Arsenal have changed for good this season; getting a new midfielder to get everything right is the best thing as they have it now, so I believe everything will go smoothly as we want. However, the Premier League is very tough competition, but I think Arsenal can also make it to the final and get the title, as if Manchester City were very strong; no one will argue that, but as it is now, we are also ready for them this season. Arteta has already fixed our problem, and we are fully ready for the tittle race this season; none stop this time around.
Manchester City and Liverpool are the only clubs that I personally think would become headache for Arsenal this season. We know the tactical changes towards these Arsenal squad, the Gunners expects to maintain their stellar performance this season. Mikel Arteta have done his best to zealed up the potentials and explore good results for the club. Arsenal have focused more on winning matches. Mikel Arteta will not be pleased with the channeling of energy towards average clubs, they've build an empire and trying to develop the club into another dimension, basically a good run for the club.
Saying that Arsenal has changed for this season seems like Arsenal has not been good. For the past two seasons, Arsenal has been the best team in England to my personal assessment. These guys are good and they play good football as well. The problem of the team comes towards the end of the season when they will lose focus both in the European competition and the English Premier League and other local trophies.
So, the major work lies on the coach Michael Arteta to be able to know how to manage his team now that he got a good squad depth and remain strong till the end of the season.