Players in china cannot opt out at anytime they choose. They have to be released from thier contract which does not happen in China. (Unless you are a complete douche like Kenyon Martin) But even if they are released, Chinese Basketball Association rules prevent players released from a team to joint another professional basketball team until thier previous teams basketball season is officially over. The earliest is March depending on how far the team goes in the playoffs, That is ofcourse if the team makes the playoffs. :-)