I know this is basically pure evil in me saying this, but I'm not sure Pierce is going to be the same Pierce we are used to seeing. I think that Green will end up starting about halfway through the season. His skill set compliments Rondo much much better and the second unit needs a good ball handler (Pierce). As for stats, I think that he can probably put up close to 18ppg, 5rebs, and MAYBE 3asts.
Either way, I'll be happy just seeing my Celtics play.