We've been mentioning GeForce GTX 1660 or whatever the final product is going to be named for a while now. The Turing GPU would position itself in the mainstream domain, yet without any Raytracing cores.
We actually expect GDDR5 and GDDR6 version of these new cards in mobile and desktop variants, and if there is a xx60 range, you might as well expect a xx70 product series, we assume.
The rumors and chatter are now so diverse that it is getting hard to deny it's existence and guess what, an Ashes of the Singularity (AoTS) benchmark has been spotted with the presumed GeForce GTX 1660 Ti (yes correct Ti). The card has been put through its testing phases on a Core i9-9900K processor-based PC ( An 8-core / 16-thread processor with a clock speed of 2.10 GHz may well be a laptop processor, making it possible that the GTX 1660 Ti tested is a mobile gpu). At 1080p and DirectX 11 which delivered a score of 7,400 points, which is in the GTX 1070 area. Reportedly, the new card has 1536 Shader cores, compared to the 1920 cores of the RTX 2060. That's still 20 percent more than the 1280 ALUs on the (slower) GeForce GTX 1060.
Seeing this result, and if valid. The new card might be out and about sooner than you expect, next month already?
NVIDIA GeForce GTX 1660 Benchmark Surfaces in AotS Database