I just bought a Sony smart TV. When I opened my Google Play Movie app, an offer popped up "Get your 4K/UHD movie on us!"
Here are the movies listed:
The Amazing Spider-Man
The Amazing Spider-Man 2
Billy Lynn's Long Halftime Walk
The 5th Wave
The Smurfs 2
Underworld: Blood Wars
The Dark Tower
Close Encounters of the Third Kind
I'm sure plenty of people bought new TVs the past few months and probably more for NFL playoffs and Super Bowl. Check your apps!
I personally got Homecoming. Enjoy!