Is MPEG-4 Systems finalized ?
Yes and no. MPEG-4 introduced the notion of versions, another name for Amendment, the official ISO denomination for extensions of standards. New versions add features into the MPEG-4 arsenal. New versions do not obsolete previous Versions, they just add different additional functionality. MPEG-4 Version 1 was finalized in October 1998. A second version has been finalized in December 1999. Other versions are currently under development.