It's too early to make sure, but these latest PCBs seams to be non-reference. Earlier leaks shows much shorter reference-PCB as this one:
http://tof.canardpc.com/view/6fa7192...9fde3494b3.jpg
Ths picture was Posted at:
http://www.overclock.net/nvidia/9026...cb-leaked.html . It's 3 weeks old and may have changed, tho. Not easy to say what's reference-PCB today.
But, from the look of it, nVidia seams to be giving open-hand to parters, both on PCB and coolers from the start. In case, 560 may show up in many different forms and shapes.
Anyways, I suggest you wait and see 560 before clicking that order-bottom on 460. You may regret fast.