Yes, the program known so far as "my rst2pdf editor/previewer application" is now called Bookrest.
What's a bookrest? It's a thing you put a book on.
Why Bookrest? I hope someday people will have books open in bookrest. Plus, it ends with "rest", which is the preferred abbreviation for reStructured Text.
And what's the outline view? It's a clickable tree with the outline of the document, of course.
As usual, let's go to the video:
The background rendering was done using python's awesome multiprocessing module.