Last season, Chicago Bulls and New York Knicks didn't make it to the playoffs so there will be a struggle I think in the 5th to 8th spot for Miami Heat. So I think the chance of taking the 2 spot will now be taken from this team.
Miami Heat must maintained good record and try to outshine the other East team especially the New Orleans Hornets, Boston Celtics, Detroit Pistons, Atlanta Hawks and the Indiana Pacers.
Well the top 2 maybe Cavs and Raptors again.
I see East teams that will make a sure spot for the Playoffs are:
Cleveland Cavaliers - No doubt
Toronto Raptors - No doubt
Chicago Bulls - With the acquiring of Dwayne Wade, Rajon Rondo and Isaiah Canaan, Bulls phase will be more on running now. Alongside Jimmy Butler on the perimeter.
Atlanta Hawks - The Hawks led the league in opponents field goal percentage last season. And now they acquired Dwight Howard, no doubt a good addition in the paint.
Detroit Pistons - Many teams surprised with the new Pistons. Also their starting five averaged in double figures last season.
Indiana Pacers - Just need more help from Paul George's teammates.
Boston Celtics - Yeah Isaiah Tomas. Also they signed Al Horford, one of the three player in the league last season who has a monster stats.
New York Knics - Carmelo Anthony + Derrick Rose tandem.
All your prediction is good and I think they will all go to the playoffs, the question now is, who is going to face the cavaliers in the east finals, it was already given that the cavaliers will be able to advance easily.