Looks good; a few nits:

 > boot after upgrade.  Use of an old bfu script with these new bits will
 > result in no network interfaces being available at first boot, which
 > can be rectified by rebooting a second time.

I'm not sure it will result in no network interfaces.  Instead, I think
the legacy nodes will just be used and by and large things will "work".

 > The bfu script was changed to merge the /etc/dladm/aggregation.conf
 > and /etc/dladm/linkprop.conf files into a single
 > /etc/dladm/datalink.conf file with a new format.  Once the upgrade is
 > done, bfu removes the old aggregation.conf and linkprop.conf files.  A
 > backwards bfu across the UV changes will not result in the old
 > aggregation.conf and linkprop.conf being restored.

As Cathy commented, the old files are not removed; they're suffixed with
.bak.

 > This is also a flag day for users of _I_nstall.  This project

I think the usual notation is "Cap-eye Install"

 > chipsets, migration of networking-related configuration from one
 > system or zone to another, etc...  For examples and documentation,

One dot after "etc." is enough :-)

-- 
meem

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