Magic and EXI Header...

Greetings,
          Working with different file formats, I am the creator
of tools that permit identification of different resources (files). I 
have noticed that EXI Structure only contains a 2-bit signature to
differenciate it from standard XML Documents. As stated in the
draft standard, this may be changed in the future. For me, for
easy identification and to avoid conflicts with other formats, this 
would require at least a 32-bit signature/magic value. Has the issue
been decided on?

Any clarification would be greatly appreciated.
Carl