I hope to hit the ground running when the UMG tool comes out because I’m interested in creating a really interactive UI for my game without having to get into c++, So i m just curious what type of content do you think i should make to use with UMG. For example is it just 2d images and if so what kind of file extension am I looking at and what tool can i easily make them in, hopefully blender. Thanks.
UMG is based on slate, so you might start your search there. Otherwise, hopefully a dev chimes in. I am looking forward to UMG as well. 
Hey,
After running the editor (UE4Editor.exe, not the launcher) with the argument -umg. You’ll find a new Blueprint entry “Widget Blueprint” under “User Interface”.
For the short time I’ve used it, it contains “containers” and “controls” (based on slate). For each control you can specify a “Slate Widget Style” created using UE4, bind a click event, defining a tooltip, sound event for pressed and hovered and much more
Check this screenshot :
That looks cool thanks for adding the screenshot. Hopefully Epic can fix the issues I’m seeing with my blueprints (crashing) and then I’ll be able to play around in 4.2