Restyling Main Window App

Could be a nice leap in quality, CUBA applications, have a main window with a sidebar a little richer and more dynamic with a pop-up menu and management hover pointer and animations. In addition to having a richer bar app. Exactly like this:

I believe here already posted similar request.

I’d like know from guys CUBA, if is there a plan to have new fresh style main window to default.
The platform would be much more attractive to have a couple of alternative layout proposals for the main window.