I actually doubt that. There's enough interest in NFSv4 that it's likely to take off pretty quickly. Netapp has already done a preliminary implementation (according a paper I found somewhere, written by one of their engineers).
Probably
http://www.nfsv4.org/bakeoff/netapp/BakeOff/index.htm
"NFS-v4 Bake-off What I Learned" by Dave Noveck of NetApp. It's dated 26 October 1999, so don't be put off by
http://www.nfsv4.org/bakeoff/netapp/BakeOff/sld004.htm
"What I didn't implement (no time)".
See also
http://www.citi.umich.edu/projects/nfsv4/index.html
which is a project we and Sun are sponsoring; they're developing NFSv4 implementations for Linux and OpenBSD. (The OpenBSD one would probably fit into the other BSDs with some work.)