One of the best features of this new preview version is that it supports both canvas and model-driven apps, whereas the original version supported canvas apps only. As with the original Windows Player, the biggest benefit (compared to running Power Apps in a
web browser) is that it offers a fast way to access and open apps and provides great support for offline use.
Unfortunately, the new preview version is still a work in progress and most notably, it lacks the ability to organise apps. For instance, the ability to pin apps (that is, to create shortcuts in
the Windows start menu to open a specific app) is missing and the
ability to display favourite apps at the top of the app list is missing.
However, Microsoft is planning to add these features, along with
support for push notifications.