Comment # 2 on bug 1063164 from Michael Andres

--gpg-auto-import-keys just tells to import a key  IF  the command is in need
to do so.

Adding a repo does not immediately download metadata (unless you inserted a
CD/DVD). 'ar --refresh' turns on the autorefresh option for the repo, but it
also does not perform a refresh.

A key is usually fist 'seen' upon the first command that performs a refresh. So
after adding a bunch of repos, you can call 'zypper --gpg-auto-import-keys
refresh' to get any new key imported.