Before showing a message stating "SOMETHING BIG IS COMING TO THE AMD BATTLE ARENA!", you have to enter the code 6000. Basically, this is pretty much official confirmation that the Big Navi GPUs will be launched as the Radeon RX 6000 series.
AMD has confirmed multiple times that we should expect Big Navi this year. The company employees also said that Big Navi consumer graphics cards should also launch before the next-generation consoles, which are also based on RNDA2 architecture. The consoles are currently scheduled to launch in November, indicating that the launch of the Big Navi graphics should be expected around this time.