There are a few UI tutorials on our YouTube for various things but the way you make UI in the new system is so much more standalone than the legacy way of doing things, to the extent that you can basically make all of the UI through the inspectors and canvas options without any 3rd party plugins.
All you'll need Playmaker for is firing events from the buttons and updating text values, really.
Plus there are tons of built-in features in the Canvas to handle aspect ratios, multiple resolutions, scale, different input types (i made a UI for the mouse and it 'just worked' on a touch TV), directional button navigation and lots of other stuff, identifying first selected... It's all in the UI inspectors now.