Except for the price, most of the specifications were already leaked, now there is certainty about the CES from Nvidia. From January 15th there will be RTX 2060 models worldwide, whose prices will start at 369 Euro.
For this one gets 1920 Shader/CUDA cores with 6.5 TFlops FP32 computing power. In contrast to the RTX 2070/2080 (256 bits), the 6GB DDR6 memory is only connected with 192 bits. In total you can expect about 2/3 performance in video editing compared to an RTX 2080, which costs about twice as much.
Under Premiere the 6GB memory should be sufficient, but Resolve recommends 8GB as the minimum memory for 4K editing since more complex GPU algorithms can be used (e.g. for denoising).
In order to stay on the safe 4K side, Nvidia would probably recommend a GTX 1070 (Ti), an RTX 2070 or one of AMD&s current graphics cards, which currently offer the better price-performance ratio under Resolve.