The new model will reportedly be launched towards the end of September or in early October. It's believed the GeForce GTX 1650 Ti will either have 1024, 1152, or 1280 CUDA cores. For comparison, the GeForce GTX 1650 has 896 CUDA cores while the GeForce GTX 1660 has 1408 CUDA cores. There's still a relatively big gap between both cards, which will be filled by the GeForce GTX 1650 Ti.
Memory is probably GDDR5 or GDDR6, with the former being more likely. Pricing is expected to be in the 180EUR to 200EUR range. The GeForce GTX 1650 currently costs around 150EUR while the GeForce GTX 1660 retails for 220EUR.