The Yanks pythag last year was 79-83 last year. They outperformed their pythag by 6 games, which is a lot. Here's what I expect from them:
C - Huge improvement. McCann is so much better than the dreck they had last year it isn't even funny.
1b - Improvement. I assume Tex will be pretty solid, though he has been on the decline for years now.
2b - Huge loss. Cano was by far the best hitting 2b in baseball last year. Major drop off.
3b - I guess Kelly Johnson can be better than what they had last year, but ARod is still a better hitter.
SS - Probably will be better IF Jeter can stay healthy. Big IF.
OF - Improvement. Lose Granderson (who, granted, didn't play much last year), but gain Ellsbury and Beltran. Soriano for a full season should help too.
So offensively the Yankees should be much better. Pitching? Well, you lose a TON in the bullpen when you replace Mariano with anyone. And starting pitching? I think CC is just on the way down to begin with, Kuroda is a year older, and as intriguing as Tanaka is, he's (a) unproven, and ( replacing Pettitte. Pettitte isn't Cy Young, but last year he did give them 185 innings of 3.74 era (108 era+) ball. If Tanaka can give them that in year one, I'll be surprised. So the pitching should be worse than it was last year, on the whole.
Since they over performed their pythag by 6 games last year, figure the odds are that they'll come back to earth and perform at about what their pythag suggests they should. But I think their pythag should go up from last year. I see NY as winning between 86-92 games this year, and be in the running for the wild card, with a good chance to get into the playoffs. To me, that's a very fair assessment of this team.