The current Turing architecture is the first and only GPU architecture that can do real-time ray tracing but it's no secret that Turing isn't really good at it. Ray tracing takes a huge amount of computing resources, which makes it impossible to use the technique for more than Full HD gaming with current-generation hardware. Still, we do believe ray tracing is here to stay, but it will likely take a couple more generations until the performance catches up.
This is obviously not the first time we have heard of Ampere graphics cards or even a 2H 2020 launch date, but this is the first time we are hearing of GTC 2020 as the subject of a leak. GTC is NVIDIA's premiere gaming technology show and it would make a lot of sense to reveal its brand new Ampere lineup during the conference. While we have not heard anything from TSMC (in fact, the recent report from Taiwan doesn't even mention NVIDIA as one of the clients for 7nm), use of Samsung's 7nm EUV node is not out of the question for the company and may in fact be utilized for Ampere graphics cards.