I've used xdg-app long ago, and yes I missed the rename
But due to the canonical buzz on every site (including the registerer) about porting snappy craft to all distros and people commenting about flatpak.
Flatpak should have better public coverage.
In case folks hadn't seen announcements, xdg-app has renamed and launched with active list of sandboxed apps. Very cool stuff.
Cheers
Matt