The Celtics have done so many things right in their very quick re-build. Hoarded 1st round picks. Made a smart trade to get a now All-Star PG. They're part of that ridiculously close block of 4 teams that are basically dead even for ranks 3 through 6 in the East.
Now, the interesting part will be if they can attract a top tier free agent or swing a trade for a top player with all those 1st round picks. My guess is that it is probably still very unlikely just due to the nature of the NBA at this point.
In the offseason the Boston Celtricks are the number 1 team that will make the most improvements through draft night and Free Agent Market.
The Celtricks will be the team with the lowest cap-space in the post season games, plus the offseason will have a huge increase in teams cap-space that will have a lot of the top FA looking towards joining a Celtricks team that made the playoffs the past two seasons.