https://wccftech.com/nvidias-ampere-gpu-likely-delayed-to-q4-2020-and-its-not-just-because-of-coronavirus/

The legendary user AquariusZi has just posted on the PC_Shopping forums that he has learned that the RTX 3000 Series (powered by the Ampere GPU) will not be landing till Q4 2020. While this decision is obviously impacted by the Coronavirus which has pretty much halted the global economy, a major part of this decision is NVIDIA's desire to wait and see how AMD's Big Navi perform - which it expects to see before Q4 2020 (good news for AMD fans?). Keep in mind however that while AquariusZi has been very reliable in the past, the situation with COVID could change suddenly and unexpectedly so I will be marking this as a rumor.

NVIDIA clearly had something juicy planned for GTC. That much is obvious from the fact that they tried every trick in the book to save it. First they attempted to enhance security procedures at the event and refused to cancel it. Then they moved it to an online show. The attempt to turn it into a news-only event didn't work out either (you can't really build hype that way) and now we have just the usual GTC stuff that will be live-streamed.