Unified SPF IDs?

There seems to be enough interest in exploring the Unified SPF concept 
further that perhaps a formal ID is now warranted.  Meng and I can 
write this up if the working group would find it useful.
In particular, this would be a re-factoring of the SPF syntax and 
testing framework to embrace the various kinds of checks that have been 
discussed on MARID (PTR, HELO, MAIL-FROM and PRA), in a way that is 
compatible with the existing SPF classic deployment and consensus ideas 
from this working group on Sender-ID.
Thoughts?  Do folks think it is time for Meng and I to do this work?  
Long weekend coming up....
        - Mark