Arsenal had a good season, yes it ended in a disappointing way because they couldn't win the league, but it was nothing like a bad season, they finished second and took a huge step from where they finished the previous season. I am pretty sure they are going to be busy in the transfer market, they do not have money at their disposal like some of the other big teams in England and Europe, but they can afford to make very decent signings. Arteta would be looking at the areas he feels his team needs strengthening and he will want the club's hierarchy to go for the players he feels can fill the voids, they cannot dominate England for now, but they will be able to compete with City yet again.