Well, BP has responded yet again. PECOTA now predicts the Yankees as the best team in baseball. The bombers are projected to win 94 games, with the Red Sox hot on their heals with 92 victories.
At first glance the improved performance from the Yankees is addition by subtraction. For example, CC Sabathia's projected numbers look the same (you can't access old projections, as far as I can tell) except those numbers translate to about 10 more runs than they did yesterday, which is about one win. A.J. and Pettitte now project much better as well, with the bulk of the improvement coming in relative value, not overall performance.
BP now feels that Joba will have a true breakout season, but that Mariano Rivera will have his worst season ever. PECOTA also still foresees the beginning of the end for Derek Jeter, and the end for Jorge Posada. Feel free to extrapolate from there.