After releazing NVIDIA GeForce 1660 Ti internet resource Videocardz published images of new videocard and shared with specificaation of GeForce GTX 1660.
New videocard will be based on modified TU116 chip with 1408 CUDA cores (against 1536 for the 1660 Ti) up to 6 GB of GDDR6 video memory and 1530 MHz (up to 1785 MHz in boost mode). Models with factory overclock are able to get 1860 MHz. Expected price of this GPU are 219$.
Source: http://4pda.ru/2019/03/13/356388/