PC World has this exciting news.
Pascal will use NVLink, to enhance the PCI connection between cards, and allow for 5x to 12x speeds over PCI Express. And with 3D stacking of chips to increase bandwidth between components we will have serious powerhouses here.
And the Titan Z has 12GB of memory and 5760 CUDA Cores! Wow, think of the CUDA accelerated editing with that! And Pascal will be even faster than that. AWESOME.
And this is why it was insane for Apple to give up on user expandable PCI Express cards in their computers. By limiting graphics to only specific AMD cards they have done their customers a huge disservice, and this is likely why I will end up with a PC someday.