@uwpviolator You should be able to use the new client, but it won’t automatically update. As far as the communications between the client the server, nothing has changed.
The only other difference, your devices won’t automatically update to 0.11.13, unless you download the files from github, place them in place of your current files (under /var/www/fog/client/), and then edit the /var/www/fog/lib/fog/system.class.php FOG_CLIENT_VERSION line to 0.11.13.