I feel like it is going to be a bit of trouble for Celtics and should not be all that easy, we could end up seeing them not do that well at playoffs. I am not saying they will, I am just saying that it is one of the possibilities that they should be careful about anyway.
They are playing the system that was orginated by Brad Stevens, the coaches are just guided as the current coach is already the 2nd coach for Celtics afer Brad Stevens got promoted to become the president of basketball operations for the Boston Celtics. (https://en.wikipedia.org/wiki/Brad_Stevens).
However, like in the past, they seemed to struggle in getting the championship, the longest they reach was when they reach the NBA Finals but the experience Warriors beat them.
I can see that they have the best chance this season. I think we will be seeing the defending champion (Denver Nuggets) vs the Boston Celtics, and it will become an interesting NBA Finals as there will be a game 7 on this. That's my vision this year, so hopefully it will happen and Miami Heat will not upset them again. It's a differenet squad for Miami since some role players were sign by other teams but they are still very dangerous as the starting players and their coach are still here, the heat culture is going to be emphasize again in the playoffs.
Too early for that but it can be a good match up, Jokic against KP size and skills though the Joker still got a huge edge against aninury prone KP but in terms of lineup Boston also have all the support that they need, I guess if Boston continue dominating the East, against Butler, Giannis and Embiid they have the good chance to move forward and reach again the finals.
While in the West side, I also believe that Nuggets can proceed defending their title, though it's more harder in the west as there are many super teams that can challenge them.
Still too many games to play and changes during the playoffs with new system to execute, we will see unpredicted movements for sure.