"Show more Tiles" setting availability

Yep, from what Microsoft have said, this appears to be coming to all screen sizes. It would be good if WPC could actually get this confirmed though as they've been saying 4.5" and above. But if Joe Belfiore's wording is correct, we'll all get this option in WP8.1.
 
If you watch 630/635 videos you can see that there is only 2 tile sizes if you choose show more tiles so you can have 3 medium or 1 large 1 medium tile on a row if your screen is small.