I see both Eddie and James coming back next year. I can't say the same for Tony Allen. I see Giddens and Walker both making the team, so I doubt they do much on the Free Agent market. With House, Posey, Giddens, and Walker coming back/making the team, the Celtics will carry 12 active players and 13 total players including Scalabrine.
I think they are content with Powe/Davis as the center/power forward back ups as they were more than serviceable this year, and that no real significant free agent move is made until half way through the season. I could possible see them signing a couple of undrafted free agents like they did in the past years to see if they can make any contributions. Thats all though.