I would think that the playoff roster would be:
12 Pitchers
8 Starters: McCann, Lee, Conrad, Gonzalez, Infante, Heyward, McLouth, Diaz
5 bench players . . .
David Ross is a given
Eric Hinske is a given
Diory Hernandez probably has to make it as the only real middle infielder backup.
Melky Cabrera makes it since he's a switch hitter and plays multiple OF positions.
1 roster spot for either Rick Ankiel, Troy Glaus or Freddie Freeman.
All this goes out the window if they decide to go with 11 pitchers in a short series and keep an additional roster spot for a position player.