Hello,
I just switched my project to Unity 2018.1 because I'm very interested by his new features but I'm a bit worry about Playmaker because, there are some errors (procedural meterial folder is incompatible so I just deleted it) and there is no way to work with the uGui addon.
I saw on Twitter that uGui will be integrated to your next release, that's nice. But what about other addon like Arraymaker (not yet integrated in my project, but I will need it soon).
In general, I'm very happy to use Playmaker but I also have the feeling that the documentation (wiki) and some addons are a bit obsolete... It's not always easy to understand what to use. Even, the tutorials on YouTube are so old.