In case you missed it, Nvidia Geforce GTX 1660 Ti is based on Nvidia's TU116 GPU and although it lacks the RTX and DLSS features of the RTX series, it still ended up faster than the GTX 1070 and is a worthy successor of the aging GTX 1060, putting a lot of pressure on AMD's mid-range lineup and possibly triggering a price war.
According to Digitimes.com report, the rest of the GTX 16x0 series lineup, including the GTX 1660 and the GTX 1650 are coming soon, with the GTX 1660 launching on March 15th. It will probably be based on the same TU116 GPU as the GTX 1660 Ti but with fewer CUDA cores and lower memory amount. If the rumor is correct, it could launch at $229.99, making it $50 cheaper than the GTX 1660 Ti.
The Geforce GTX 1650 could be based on a different and even smaller Turing GPU, most likely the TU117, and should launch on April 30th, with a price set at $179.99.
Andreas Schilling from Hardwareluxx.de teased a bit more information confirming that there will be a GTX 1660 with 6GB of memory while the GTX 1650 will end up with 4GB of GDDR5 memory.
There will be plenty of different custom versions from various Nvidia AIC partners, as these are their bread and butter.