For what its worth ... my dealer clarified when changes to specification can be made ...
A car when ordered goes through 3 stages
1100 The Initial status given to orders placed that are over 4 weeks away from build.
1200 Given at 3 weeks or under prior to build date Build is confirmed by Factory but may take a spec change.
5055 Car specification now locked car due to start production.
For a more detailed compiled list of codes also see
http://f10.5post.com/forums/showthread.php?t=432269