Obviously I will be cheering for Barca, but I think Atletico Madrid will be able to stage a comeback this season. They will probably finish third, since I doubt Valencia will be able to hold that position without Villa or Silva. Sevilla, Villarreal, and Valencia will probably vie for the fourth spot. Think it may be more interesting than last season, since we signed Villa and Mascherano but Madrid has Mourinho who undoubtedly is the best coach in the world right now. Anything can happen, although yeah the actual title will be down to those two teams.
Even though Barca is enjoying a lot of success, I wish there was more competition than just Madrid. Hopefully a team like Atletico can provide that extra competition.