Just saw Bryce post this on nfsv4@linux-nfs.org:

Novell is now including the latest NFSv4 packages with kernel support
for NFSv4 by default in their SUSE 10 Beta 3.  You can activate NFSv4 in
SUSE Linux 10.0 Beta 3 and onswards by setting NFS4_SUPPORT="yes" in
/etc/sysconfig/nfs.  They are testing using pynfs and finding similar
results as the other testers.  Note this is not SLES10; beta testing of
that will begin later.

Bryce

Those with more linux knowledge can correct me, but i believe that makes SUSE the third linux distribution to include NFSv4 behind Gentoo and Fedora.