I strongly suspect that's the right way to do it, I haven't done it yet myself, the little AMD cpu in my machine may not be supported, I just don't know
To update to this release, select the 11.2-STABLE train in System → Update. Should you need to return to the 11.1 series after updating, reboot and select that boot environment from the boot menu.
The problem with being a beta testers is lack of info about what is supposed to work as of now. E.G. Can't install a plugin unless DHCP is used. So is that a bug in plugin install process, or a known limitation of the underlying iocage, or something else? The error message about DNS failure is misleading as the test box can ping and do nslookups OK.