The team will have to make some choices in that regard. I'm assuming Detwiler, Edwin Jackson and Marimon will definitely be gone. Jackson is a free agent. Not sure about Detwiler, but even if he isn't I don't think we'll be keeping him.
After that we will probably have to let go of two more guys if we sign 3 FA relievers, 1 starter and 1 catcher this off-season. If we add Gant to the 40-man (and I think this is likely) the number currently on the 40-man who will have to be moved off increases to three.
The choices for who to move off the 40-man will come from Burawa, Kelly, Cunniff, Cabrera, Weber, McKirahan, Marksberry, Lavernway, Cunningham and Eury Perez. My guess is that Burawa, Kelly and McKirahan are the three most likely to be moved off from this group.
I'm not sure of Moylan's status. I believe he is in year 1 of a 2-year minor league deal that guarantees him an invite to major league camp. I'm assuming he will not be on the 40-man.