The Twins could potentially win 70-75 games this year, but a lot would have to go right. Almost everything would have to go right if they end up winning 76+ games.
Although I am confident in Perkins, I'm not really sold on Capps as a Championship quality closer, and Zumaya's ability to throw the heat when he's healthy is exciting, but will he be able to stay healthy? I think the Twins' bullpen is very thin. Some of the other guys will have to step up this year for sure.
I'm not sold on Revere as an MLB caliber outfielder. Nice guy, great speed, but he has a weak arm and needs to be much more consistent and productive at the plate. Casilla being a legitimate MLB caliber 2nd baseman is a bit more debatable. I like his speed too, I'd just like to see him get his batting average up a bit and get on base a bit more so he can utilize his speed more. With their speed, Revere and Casilla could both bunt a little bit more as well in certain situations... especially if they are in a slump.
Other than that, I think some of the players the Twins signed in the off season are pretty decent.. Carroll, Doumit, and Willingham should all help the team this year. Hopefully Marquis and Zumaya help the team on the mound as well.
However, where is the depth on this team? If they are going to start Revere in the outfield when in my opinion he is not even MLB caliber and Casilla at 2nd, which is questionable at best, how is this team supposed to win 90 games this year?
The Twins have a thin bullpen, are arguably starting a guy in the outfield who arguably isn't MLB caliber, and Nishioka / Hughes / Plouffe (outfield too) are going to back up the middle infield.. and Parmelee (looks solid as an MLB player so far) backing up first base. I expect Mauer to play better this year, but with all of the concussion problems, I don't expect Morneau to do much, although I will be very happy if he does have a healthy and productive season. This team will certainly have some exciting moments this year, but don't expect them to make the playoffs.