Is it possible to have a Visio drawing with several pages and make an automatic slideshow of those pages in Visual Overview based on a pre-defined timer?
Back in 2013, we implemented an 'Easter Egg' in the software to do something like you describe. I see it is still working.
It's not exactly what you described, because it's sliding between the different workspaces instead of between the pages in a Visio file.
Via the url parameter 'AutoSlide=xxx' you can configure an 'Autoslide' between the different workspaces. 'xxx' is the interval in seconds. (more info: see RN 5940)
At each interval tick cube moves to the right workspace.
To stop the 'Auto-Slide', just reconnect without the url parameter.
Not sure if it will be usable for you case, but it comes close, I believe.