We'll have to wait and see, but it appears the launch date of Big Navi could be sooner than previously expected. PCGamesN thinks the card is now listed in the certification database of South Korea's Radio Research Agency (RRA). The card we're talking about has model number D30201 and passed certification on February 3, 2020.
This implies there's a good chance we'll see the launch of Big Navi in March or April:
The RX 5600 XT model number, D32501, passed certification on December 3, 2019 with a release on January 21,2020. Similarly the RX 5500 XT, presumably D18902, passed on November 27, 2019, with its release on December 12 less than a month later.
Given that AMD has already stated that it’s going to be dishing the dirt on the new Radeon RDNA 2.0 architecture on March 5, and that there’s the potential for the high-end Navi to be the first graphics card to hit our PCs sporting the new AMD GPU design.
[2020-02-03]— ?????? ? (@rra_bot) February 3, 2020
[ATI TECHNOLOGIES ULC]