Despite being the same screen resolution as the last generation, apps for the new 12.9-inch iPad Pro need to be updated to accommodate the rounded corners and Home indicator. Un-optimized apps are letterboxed for the status bar and Home indicator. And apps that were not updated for the 12.9-inch, in general, get pillar boxing as well.
Netflix’s release notes-
Someone, eyeing your Netflix app on the bus? Make sure it’s the latest and greatest. Get the update for our best experience yet.
And in this release, we fixed bugs and made performance improvements. Just for you.
This is easily noticeable in video apps as full-screen videos don’t go to the edge of the iPad unless it has been updated for the new iPads.