tl;dw: ability to select drive AND folder location as default on said drive, view and modify file contents for "most" games [presume this means old UWP games from years ago won't qualify] and games that officially support mods will get a label. Improvements to download speeds. Cloud gaming (which was already there). Coming to Insiders very very soon, which you can join using the little spaceman icon at the top. Continued improvements to come