This keeps coming up, but I would be absolutely shocked if any of the starting 4 returning from last year are not starting this year.
While Doc will clearly need to find a way to get more out of the bench, and get the old guys more rest, I feel pretty confident that he sees the egos being too big, and the chemistry being too good in that first unit to mess with it...with the only exception being if they somehow add a player that is actually better than any of them (which is incredibly unlikely).
I also think Doc really likes the idea of bringing Green off the bench, so he can benefit from being covered by second string players. He may not be a top line starter, but he absolutely should be a top line bench player.
I do think they will be much more creative with the minutes though. Getting guys on the bench in there earlier, and more often, but I think it would take a significant event (much more significant than a birthday) to get Doc to bring any of those guys off the bench.