Arsenal not playing well towards the end of the season has been Arsenal's major setback as to why they haven't won the Premier League title in the past 3 Premier League seasons. Arsenal have signed a lot of players this summer, and I believe they now have a good squad depth that will help them perform well towards the end of the season. Shouldn't be surprised that Tottenham Hotspur defeated Manchester City because Tottenham Hotspur is like Manchester City's nemesis.
It's too early to say anything but with how bad Manchester City performed, it's likely going to be Liverpool vs Arsenal again. Liverpool looked quite good in the first game too and Arsenal too gave an statement that they are going for it. Chelsea could have been another contender but they have made too many changes and were not ready for the season. Drawing to Crystal Palace means they won't have an easy way froward. The season looks to be similar to how it ended few months ago.