I think they'll trade the pick. If we get lucky and get #1, Philly will probably be at #2 (because they have the worst record) and a trade should happen.
Celtics trade: #1
Philly trade: #2, Noel
We already know Noel and Okafor don't work together, but Simmons and Okafor would be a dream combination. If Embiid can get healthy they'll be set for bigs for years, but even if he doesn't, they'll still have their starting front court of the future. The celtics get two great pieces that perfectly fit their roster. A scoring wing and a rim-protecting center.
Smart/IT
AB/Hunter
Ingram/Crowder
Sully/Mickey
Noel/KO
That's a pretty good lineup before free agency even starts.