Im praying they see sense and drop it and stick with the old/current one (or at least let us keep using the old one forever). I used a Syento system a few years ago and although their appliance web UI looked cool the most basic of tasks either couldn't be performed or were really hard to figure out because they were trying to make everything simple and one click. It appears FreeNAS is being taken down the same road. I except the old/current FreeNAS UI wouldn't win any beauty contests but its functional. However perhaps its just me and I just don't like change ;)
I think the UI is way over-due for an update. So, I like to see a step in that direction (again). It can look cool and be just as functional or even more functional. I hate to point it out. But, recently worked on a friend's Synology server. It isn't sexy looking and it doesn't have the ZFS advantages (that I could see). But, it is really well organized and "just works". Many of the tasks that commonly require jumping into shell on FreeNAS were simple GUI options in their front-end.
In the short term, the blog post that announced 11.2 recommended switching to 11.2 for plex users and to re-build plug-ins. But, the path to doing that isn't very clear. For example, it's unclear even how to set which IP address a jail should use. So, even if I wanted a purely vanilla plugin install, I can't do that without causing the installs to be on new IP addresses, throwing off every device in the house.
I think I see where IP address is supposed to be set. But, it's using terminology that I'm not familiar with and strange error/options handling in that section. It appears like a case where advanced IP options are too up front and interfere with the more common use of those settings.
There doesn't appear to be a "paste" option in the new GUI shell either...