Tom's Hardware Guide published a review on Nvidia GeForce GTX 1070 8GB Pascal Performance
A quote from the article:
Nvidia's GeForce GTX 1080 is the company's Pascal-based flagship, but its upcoming GTX 1070 is bound to turn more heads with a $449 price tag and GeForce GTX Titan X-like performance.Nvidia GeForce GTX 1070 8GB Pascal Performance Review @ Toms Hardware