Chelsea's squad is very strong, they should probably be favourites, and I'd be surprised if Mourinho can't win the league with this team. It'd be a big failure otherwise.
Courtois
(Cech?)
(Schwarzer)
Ivanovic - Cahill - Terry - Filipe Luis
(Azpilicueta - Zouma - Ake)
Ramires - Matic
(Mikel - Van Ginkel)
Willian - Fabregas - Hazard
(Salah - Oscar - Schurrle)
Diego Costa
(Drogba)
(Torres)
They look maybe one defender short, but the likes of Ivanovic, Azpilicueta and Ake are very versatile.
City are closest to matching them, but the PL should have 5 strong teams this year on paper, and United have a big advantage with no European football. You will see Mourinho whine and moan like crazy about this all season.