Google Play Movies upgrades some movies to 4K for free for you

Google just gave a nice little Hallowe'en treat early to some folks that have been buying movies on Google Play Movies.

If you're like me, and don't have a 4K TV, so you paid for the SD or just HD version of a movie, Google is upgrading some of those purchases to 4K for you automatically.

Now I just need a 4K TV to really enjoy that picture (oh, and time to actually sit down and watch movies!)

What movies of yours got upgraded?