There are two videos available on Twitter, but they run through most smartphone uses, from email to ebook reading, from mapping to gaming to shopping:
It definitely didn’t make sense to build this back then, but it was a lot of fun to work on pic.twitter.com/p4VxGkxEnJ— Mike Kruzeniski (@mkruz) October 4, 2019
Very impressive - although these appear to be captured from an emulator, implying that the software existed and it was then just a question of making the hardware(!), I suspect that what we're seeing is 90% mocked up by a visual animation team. But it's all extremely believable.
As several companies have found in the last 18 months though, actually making a dual-screened or folding device isn't trivial. However, with recent hinge designs and also recent advances in folding displays, this kind of split-screen UI is only going to be seen more and more. And we almost had it a decade ago!!