New update rosters as of 08-08-13 here: http://www.mediafire.com/download/1wbq6lv1jv4d30x/NBA_Roster_Update_Patch_8-8-13.zip
Download updated roster patch here http://www.mediafire.com/download/5ahxx2d07wy2yt8/NBA_2K13_Updated_Roster_Patch.zip
Source: long hexpads from Sj1414, draft class from @derito, some player movements from 2k official roster update
includes new free agent players, new team usa roster, long hexpads and latest player movements as of aug 2013
See screenshots below:
Download here http://www.mediafire.com/download/z2o4x76eimd67wb/NBA_Roster_Update_Aug_2013.zip