After hearing MM's comments during this week; not changing the verbage of the calls, allowing Kellen Moore is continue calling the plays, in my opinion, the offense most likely will stay intact. There will no be a major overhaul at all, more of tweaking the unit.
I fully expect all the offensive fa's to return: Dak, Copper, Cobb, Jarwin. We are all not sure about Witten at this time, but many of us believe he is more of a progress stopper at this point. Perhaps the team adds a veteran TE if he departs, might use a draft pick to help the depth at the position.
MM has used a traditional FB in the past, that's a position to keep our eye on. I would like to see the team add a big, possession/red zone type of receiver, who knows if they want such a player for the offense.
Point is the offense personnel isn't changing, at least for next season. They may look to overhaul the other two units, but it's not happening here!