Damn it, dupe of a different thread. Please close.
http://linustechtips.com/main/topic/305586-anandtech-reviews-directx-12-star-swarm/
Anandtech just released a Win 10 DX 12 preview with some NVIDIA and AMD cards.
http://www.anandtech.com/show/8962/the-directx-12-performance-preview-amd-nvidia-star-swarm
From the benches, DX 12 is looking good so far.