For now it is only a graphical mockup of the interface, right? Because this is a thrilling inspiration... This is visual bacon. I like this very much. I think it is even better than Apple's Keynote (which I used to love since I have a Mac). That would suit elementary OS perfectly.
The problem, especially with LibreOffice is with so many people working on it wanting so many different feature rather than implementing a smart plugin system like eOS does they wind up with a million function that most people never uses and a user interface that has to be cluttered to cope.