There will be a lot.
Vince Carter being the leader of a young team. Will he quit on a young, bad team like he did with Toronto? Or has he rally matured and is willing to step up and play with the energy and passion he played with last season when Jason Kidd got traded. Personally, I am expecting one of his best seasons ever. The team might not be great, and might miss the playoffs, but Vince will show all the critics that he is more mature now and will be a good leader for this young team.
Devin Harris running the point. He is a good scorer and passer, but which kind of point guard will he ultimately turn out to be in the end? He ran the point well for the Mavericks, and this season many of us and even experts are expecting him to have a breakout season and win the most improved player award. Will be take over the role of leader if Carter doesn't show up? This will be perhaps the biggest for us.
And another huge one, who will step up as the third option? Moore is gone, Kidd is gone, Jefferson is gone, and even Krstic and Nachbar left. All the primary offensive weapons for this team for the past couple of season will not be wearing a Nets jersey this season. Vince and Harris are already the obvious first two options, but who will step up as the third? Yi, Sean, Boone, Simmons, the rookie CDR or an unexpected player?
This season will be a big test for the team, I'm hoping we play well and somehow make the playoffs if the team plays good enough and answers all these questions and comes through, past the obstacles.