Ortiz - Agreed, will have a monster year. No injuries (I hope!) and will still Rake.

Lowell - Decline, but I don't see it being as bad as everyone else...290/350/450???

Pedroia - Will still hit, I think he can maintain.  

Manny - Will not do as poor (power) as last year, I think he is going to hit between 25-30. Yes he is older, but I have read that he is working to get into shape... (Contract year soon?)  Though now he is getting into a contract issue/talk with the sox, so who the F knows.

AROD - No way does he decline.  Dude is nice and will rake again... but when do we see the decline?

Cano - Numbers dropped a bit last year, but did play in 40 more games.  I see him having a year 320-350/490 with increased power... 20-24 hr.

As for the Sawx, they return almost the same team that scored over 100 fewer runs than the Yankees despite playing in the most favorable offensive ballpark in the league (per ESPN's mlb park factors).  While replacing Crisp with Ellsbury is likely an improvement, I am not sure it will be as significant as everybody is predicting.  In his worst season last year, Crisp put up a .712 OPS.  In his minor league career, Ellsbury's OPS was .814.  If you think that Ellsbury will be hitting .350 this season with an OPS over .900 like he did in his call-up, then I have a bridge to sell you.

As for predicting bounce-back seasons for Drew, Manny and Lugo, that is very possible, but the same can be said for the Yankees.  Damon reported to camp out of shape in 2007 and was banged up all year, and he was reportedly considering retirement.  He is reportedly in much better shape this year, and focused and motivated.  Abreu had an absolutely lousy first half of the season, leading to an OPS more than 50 points lower than his career worst.  Jason Giambi was a non-factor for the Yankees last year, and there is a chance he could be healthy and motivated in his contract year (like Manny).  And I don't think the Yankees could have come up with a worse 1b platoon in terms of offense than Mientkiewicz/Phelps/Phillips.  Matsui, like Ortiz, also had a bad knee and had it taken care of in the offseason.  Several of those guys should be in the potential improvement category, because like Manny and Ortiz,  they all had sub career average years with external factors (in addition to aging) that affected their performances.  While you may not be hearing anything "glowing" about Abreu, Damon, or Giambi, that may be because you are too busy reading about Manny and Ortiz.  There has been plenty of discussion about Girardi's emphasis on fitness, and the Yankee players, Damon in particular, being in better shape.

As for regressions on the Yankees, I will give you Posada, who in a contract year put up numbers that were above his career line (though only the BA was particularly high).  As for A-Rod, while last season was amazing, he is still in his prime and has had seasons like that before, so 2007 was not  a major deviation from his career numbers, and it is possible that he could maintain that type of production, or at least something similar.

In conclusion, barring significant injuries to major Yankee run producers, I don't see Boston making up a 100-run deficit as their and the Yankee lineups stand.  I am even ignoring the premise of this question as looking independent of park factors, which would also favor the Yankees given that Fenway is a better hitting environment.  Even if the improvements/regressions go as Galt predicted (which is very optimistic from Boston's perspective), 100 runs is still a huge gap.

and cano is just as likely to improve as any redsox player

1. Hurdle seems to love Barmes and will give him every opportunity to take the position.
   
2. Barmes should be able to handle the position defensively, while I'm skeptical that Stewart will be able to.
   
3. I don't think the Rockies are that serious about giving Stewart a shot at 2B after a few months of working at it.