Nvidia originally planned to release the GeForce GTX 1060 products in August, but with AMD aggressively pushing into the mid-range and mainstream sectors, Nvidia has moved forward the releases of GeForce GTX 1060 products by a month and will likely reduce their prices to make them more competitive.
Leaks related to the Nvidia GeForce GTX 1060 pointed that the card uses an Nvidia GP106 GPU. This is a GPU which is also leveraged by Nvidia's Drive PX2 autonomous car development platform. Other unconfirmed specs include a 256-bit memory bus, with 4GB or 8GB of high density GDDR5. However more recent chatter suggests that Nvidia will be releasing these cards with either 3GB or 6GB of RAM onboard. Performance should be somewhere between the last gen Nvidia GeForce GTX 970 and 980 graphics cards.