I quite appreciate their current performance, Arteta was able to change Arsenal's game with amazing results. But even so I'm not so sure Arsenal will be able to maintain its position at the top of the standings. Because they have to prove it when they meet Manchester City, if they are able to get past City's obstacles then their motivation will double and the chance to win the championship will be more open.
There is still quite a long time left and a lot of matches. Performing at a steady full strength avoiding defeat is Arsenal's best way to stay afloat of Man City's pursuit. As long as this season goes on I think only these two Teams have a chance to win the EPL this season.
Newcastle, Tottenham are still too fit to compete. If Newcastle and Tottenham don't make any major changes to the transfer next winter. A slight mistake from Man City or Arsenal will make a big difference. Right now I feel like these two teams are still the same.