Candy Crush Soda Saga for W10M as an example of porting capabilities.* (Maybe that's why they didn't publish it yet for phones.)
Universal Facebook Messenger app with actionable toast notifications.
Overhauled (+universal) Facebook app.
Twitter app for W10M
Ported Periscope & Instagram to show off porting capabilities.**
We will see
I really hope that I'm not wrong about Messenger, FB and Instagram apps at least. That would explain just a bug fixing update for Instagram, minor updates for Messenger and just a one minor update since a couple of months for Facebook app.
* Project Islandwood
** Project Astoria