Chelseas first 11 is the best in the division, but behind that there is not much. If they can avoid bigger injury problems and minimize fatigue later in the season, they will defend their title. Mourinhos teams have traditionally regressed in his third season, but this time he tries to build a dynasty in one club, not just have short term success, so things might go differently.
Arsenal seems better placed for sustainable title challenge than ever before in the last decade. Still too early though to call them favourites.
Hard to say anything about City. United and Spurs were both poor in todays opener, though United have more room for improvement given their major squad overhaul.