Bucks and Raps have new coaches and some key players replaced (and new ones). Sixers brought back the same squad and coach plus Embiid and Simmons are two of the best young players (when healthy).
If anything we know what the Raptors and Bucks will bring, the Sixers could have a monster year if Embiid and Simmons are locked in and healthy.
Sixers lost two key veteran bench players in Belinelli and Ilyasova, who turned their season around when they joined last year. Those guys added a much needed vet presence and perimeter shooting. Ilyasova interestingly enough is on the Bucks again now, and will strengthen their bench significantly, as will Lopez.
A lot of hype for the Sixers despite the fact that a team without its two superstars wrecked them in the playoffs and then they lost two of their key bench vets. I can see them having a slight regression this season.
The Bucks on the other hand are trending upward with some excellent additions this summer, no key losses, and Giannis is likely to show more improvement as well.
I also expect a resurgence from the Wizards. They cleaned up some of their chemistry issues by sending out Gortat and strengthened their defense imo with Dwight Howard. Wall is back to 100% health and has a lot to prove, and Oubre should show more improvement this season. Jeff Green is also a nice bench addition for them with Finals experience. I expect them to return to the level when they took the Celtics to 7 and IT ruined his hip.