Steve I didn't crown them anything, unless you count "top half of the eastern conference", which I don't feel is a very bold prediction.
As has been said already, it will be the bench and the defense. They just signed Eddie House for a microwave role off the bench, if he can do that it will help. But he's another guy who doesn't even know the meaning of the word "defense".
Perkins is a really good defender, especially help-wise, like Hammerhead said. His problem is foul trouble. This man can foul out in 10 minutes on a good night. Although a lot of times he was helping on Jefferson's man and getting the foul, so with KG there we'll see what happens. I've heard rumors of trying to acquire Mutombo, but I'm pretty sure that's not happening.
Rondo is the most interesting part of all this. He can slash but his shot is just so terrible. If teams want to double team it will be with his man. I know summer league means jack crap, but in the couple games I watched he would drive to the hoop, and have a shot, then pass it back out to the arc. Not exactly much confidence in his scoring ability. But his defense is above average, and that's key.
It might sound funny but Scal is actually a good defender. He has the size, not so much the quickness but he makes up for it with effort.
So yeah, this team has potential to go far. I can see them winning a lot of games in the 110-120's, because in the regular season, defense takes a backseat anyway. And we all know the Eastern Conference is weak and blah blah blah. You will know by March if this team is built for the playoffs.