Under Arteta's coaching Arsenal improved very much and its very sure the tough time given to Man City is expected from Arsenal from that much close margin they lost the EPL so they came back very much stronger.
This season's Premier League has ended in an amazing way and Arsenal has certainly improved quite well during this season so that Arsenal have been able to trouble Manchester City in terms of getting the title this season even though Arsenal failed to get it this season. But for next season, I think Arsenal will remain as strong as this season and could even be better than this season if Arteta's coaching can continue to experience excellent development for Arsenal.