I'm terrible at these types of predictions, but here are mine for the heck of it:
Like many have said, the 7th and 8th seed are a crapshoot at this point. I think Carlisle and Dirk, with an improved supporting cast, is good enough to make it into the playoffs. They almost did it last season despite Dirk not playing or underperforming for a bulk of the season, and I like this year's roster more than last year's. The Nuggets, while losing Iggy, still has enough of their key players from last season for them to suffer a dip and still make the playoffs. I was tempted to list the Pellies, but they have a lot of new pieces, are relatively young and inexperienced, and will need to find a way to make Jrue, Gordon, and Tyreke work on the court.
The 6th-8th seeds are a crapshoot in the East. I think the Wizards want to make it to the playoffs so badly that they'll find a way to squeeze in as long as they suffer no additional significant injuries. The Pistons are also going to be desperate to make the playoffs because Dumars needs to redeem himself, and they have enough talent and size to make them a tough matchup as long as they can get something from their guards. As much as I dislike the Cavs (due to Dan Gilbert), they have Kyrie and some up-and-coming players in Waiters and Thompson. They also have motivation to compete so they can convince Lebron to try to rejoin them in the future. Almost put the Raptors in there too, but I suspect that Ujiri will dump Gay for expiring contracts and/or picks as soon as he can so that he can reshape the team in his vision.