Sham, the flow label is low on my personal priority list. The reason I was eager to get RFC 3697 done is to set boundary conditions on its use, but developing the actual use cases seems to me to be off the critical path for the IETF.
Looking at your email address, I can see why you might give it higher priority - but do you need the IETF for that right now, as long as you obey RFC 3697?
FWIW, my personal take --
-- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings