Now we can use NBA Today to download the latest official roster of NBA 2K10 now.
So If it is updated, we will post here.
Latest Update : 2010/01/09

Download:
uploading
hotfile

Install:
Start > Run > Type : %appdata%, then find 2K Sports\NBA 2K10\Saves , overwrite the Roster.ROS
for XP users: C:\Documents and Settings\[your user name]\Application Data\2K Sports\NBA 2K10\Saves
for Vista or Win 7 users: C:\Users\[your user name]\AppData\Roaming\2K Sports\NBA 2K10\Saves

Source