Doing an "Upgrade" of a previous beta install with the DVD installer on a
laptop that only has WiFi.
The two lines "Network autoconfig" and "Online repos" in the progress menu were
scanned and colored as "done", but no prompt to configure the WiFi interface
and connection secrets (i.e. no SSID and no passphrase asked for).
As a result an "offline" upgrade was done, with more than 50 packages left to
update from the Update and Packman repos after the first reboot.
By comparison an "Install" with the same media offers to configure network
interfaces (including WiFi) so that an "online install" is definitely possible
(as checked on another system).
Apparently some step is skipped in the "Upgrade" option compared to the
"Install" one.

BTW I didn't update the affected system after the first reboot, the system is
still "as upgraded from the DVD", so if you need logs and such they are likely
still there.