> is there any action required for somebody running the relay 
> on a pretty bog-standard Ubuntu 12.04 Linux dedi?
> other than sudo apt-get update && sudo apt-get dist-upgrade


There is a new OfflineMasterKey feature you can read about here:


If you want to enable OfflineMasterKey read before upgrading. Otherwise I'd say go for it. Don't forget:

    sudo service tor restart

You might see a prompt about a new torrc from the package update. I chose to keep my existing version. There was no noticeable change once the service was back up.