Still too much youth, and a big injury concern, for me to jump to saying 6th seed. That would be like a 20 game improvement. They'll be better...and you didn't even mention their bench which is now actually pretty damn solid...but there's still too much that could go wrong.
There's also still time for other teams to improve. A bit too early. I think playoffs are certainly a possibility, but I'm gonna hold off on my final prediction. If anything, there are too many variables and I'd therefore err on the side of caution.
They aren't besting Miami, New York, BK, Indy or Chicago. 6th is the absolute ceiling IMO.