More information still coming out on the live stream: http://www.livestream.com/amdlivestream.

Edit: It's over now. The VOD is available here: http://www.livestream.com/amdlivestream/video?clipId=pla_334.... Mantle information starts at 02:26:40.

> Mantle enables 9x more draw calls per second than other APIs by reducing CPU overhead. [0]

That's a pretty extraordinary claim. I look forward to seeing if they can back it up.

[0] http://www.anandtech.com/show/7368/amd-gpu-product-showcase-...