Rounded Corners on WP8 Tiles?

Hey guys. I was just watching this YouTube video of an HTC demo and I was surprised to see tiles with rounded corners. I think it's a new Windows Phone 8 feature! It looks a bit OK for me as long as the rounded corner radius are subtle. What do you guys think?

See the video below. Magic starts at 1:20

I captured a screenshot for those too lazy to watch the video.

Htc8_medium

Htc8zoom_medium