Where Is Windows 8.1?

[HawkMan]

I guess metro apps that scale properly are still a distant dream.

You already have that, but it's up to the app developer to decide how the app scales with dpi and size. Most apps/devs don't take advantage of this yet.

For the most basic example of this you need look no further than the start screen itself on a low res device you get 3 rows. As the display size goes up, you get more rows,