Having used a camera that has this feature I can tell you that it looks a lot better on paper than in practice.
Getting good results out of it requires everything to be perfectly still, and even the slightest motion results in some funky graphics.
Also, although I haven't actually run the calculation, I have a strong feeling that at 400mp the lenses available today wouldn't even be able to resolve the image to fine enough detail to matter. But I'm glad they're trying to keep up.