I think it's fair to say that the Bucks remain the favorites in the Eastern Conference; they seemed to have been hurt inordinately by the bubble situation, which will not be repeated. Whether they can succeed in the playoffs, however, remains to the seem.
I think the Celtics, Sixers, Raptors, Nets, and Heat are all in the scrum for the #2 team. The Celtics are relying on two young players still in the accelerating part of their respective growth curves, and do have room for organic growth from other players on their roster. Probably the only other team that can say that is Miami and possibly Toronto, although I think the playoffs showed the Raptors' ceiling.
As for the other teams:
The Nets will happily sacrifice regular season wins for health during the playoffs, but I think there are several teams in the East that can expose an aging and oft-injured Kyrie, including Boston.
Sixers are the most unpredictable right now, IMO.
The Wizards are at best the #6 team, and could just as easily trail the Pacers. Are there any other teams that are threats to finish in the top 8?