Given our depth situation, if Rolen's interested in coming over, the interest is mutual. I don't think counting on him to be a major contributing factor would be wise, but if he's got something left, he could make a difference off the bench. And Fenway ought to be friendly to his hitting style.
That said, I wouldn't read anything at all into this, to be quite honest. I don't think there's any huge chance Rolen winds up in a Red Sox uniform unless we know Middlebrooks is going to be out for weeks. We don't even come close to knowing that now.
On the other hand, which would you prefer to sit on the bench? A champion veteran like Rolen who's still got some skill even if he's not a middle of the order bat anymore, a washed-up schlub like Overbay, or a busted prospect like Carp? If you can get Rolen for bench money, go for it. He's not the perfect fit if you're going to be obsessive about platoon splits, but he makes the team better.