Ubuntu development team mailing list shows , the upcoming release of Ubuntu 20.04 will be the default version of the app store comes Snap. ubuntu-desktop and ubuntu-minimal meta-packages have been introduced into the application store, instead of the common apt / repo version.
It should be noted that this is not a new application store, just happened to be the same as the current Ubuntu Software store name, and the same is based on GNOME, except that it's just packaged as Snap applications. Function to a large extent has not changed appearance.
Repackaged application store (displayed in the other releases for the "Snap Store") still allows users to browse and install software packages from the Ubuntu apt conventional archive. It still supports processing deb installer, and still be able to carry out a firmware update.
Seek Flatpak / Flathub support of Ubuntu users will need to first install apt conventional version of Ubuntu Software (still under maintenance, and support and co-operation Snap version), because the associated gnome-software-plugin-flatpak not available through Snap.
All in all, the only real change there is an invisible change, but for most people, they rarely use the Ubuntu Software to install, manage or delete the software, after all, more efficient command line.