Nvidia recently announced they were going to release a version of the 1070, the current king of Nvidia's mining GPUs, and now Asus is building one off AMD GPU:
http://www.coindesk.com/asus-announces-new-graphics-cards-focused-cryptocurrency-mining/
The article doesn't explain this but these cards lack the video output codec, which makes them cheaper and simpler. I am not sure about how many lanes of PCI-Express they use, but I know for mining they only need one lane. I haven't seen photos yet of these things, but I expect they have single lane sockets (PCI-E sockets are designed so a 16x slot will accept 1x, 2x, 4x and 8x as well as 16x)
For those who declare impending doom for crypto mining, obviously the hardware people don't think that the market has too short a future, I would think they would not do this unless they expected they can sell them for a couple of years because every new card they make requires the creation of a new production line, or modification of an old one, which is an expensive process.
However, this will also be a suitable card for AI, database acceleration and other emerging OpenCL and Cuda applications.