most significant change comes to the back shoulder of the uniform where Nike designers altered the construction for a vastly improved fit. Additionally, the hemlines on the bottom of both the jersey and shorts were modified to allow for full range of motion.
Also;
The host team will pick which of its uniforms will be worn for each game and the visitors will select one of the contrasting ones from their collection. Previously, white uniforms were the default for home teams.
The first two editions will debut at the start of the season. The “Association” is formerly the home white uniform and the “Icon” is the previous road jersey, featuring the team's primary color.
Also, eight teams will have a “Classic” uniform available in the fall that they can wear at their discretion.
http://news.nike.com/news/nike-nba-game-uniformsPretty complicated