Allegedly, the RTX 2060 will feature the TU106-200 GPU, while the GeForce GTX 1160 will get a TU116 without RTX support. The site also notes there will be no RTX 2050, but that's not really a surprise as no one expect ray-tracing on cards as mainstream as that one.
The GeForce GTX 1660 Ti marketing material posted by Expreview mentions ‘Turing Shaders’, instead of ‘Ray Tracing’, which should remain exclusive to RTX series.Guess we'll find out in a couple of weeks!