At least heading into the season, I expect the following as the projected lineup:
Rondo / Pressey / Crawford
Bradley / Lee / Brooks
Green / Wallace / Joseph
Sullinger / Bass
Humphries / Olynyk / Iverson / Melo
I think Rondo will get traded by the deadline, though. Sullinger will be brought back slowly. I'd expect Humphries to get shopped heavily, too.
Overall I expect a 25-30 win campaign out of this group, with the possibility to go much lower if Rondo doesn't come back until close to mid-way through the season.