Yep – sort of.
Make sure you specify “-umg” as a command-line parameter. Then, in the Content Browser, go to New > User Interface > Widget Blueprint.
That will let you create a new WidgetBlueprint object. Double-click on it and you’ll get a specialized blueprint window that looks like this:
I had some luck dragging widget elements from the left side onto the area in the right, but I’m not quite sure how to use it yet, and it definitely doesn’t seem ready for prime-time yet as far as I can tell.
Epic guys, any suggestions for messing around with this?