Way to early to tell. FA can change teams entirely so can trades during the season.
If Boston gets one more decent starter by June they will have a fairly deep rotation and in good position. Boston lead the MLB in run production last season it was pitching that let them down. Considering that all of their key fielding positions and batters (aside from ortiz) will be back they still have a good shot at taking the AL East.
AL Central will come down to the Tigers or Indians depending on weather or not Indians pitching can do as well as last season.
AL West will either be Rangers or Angels. By the way if it is Rangers and Angels in the post season they will not play each other in the the ALDS they are from the same division..