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NeoGAFs Kent Brockman

A mystery Id Software game has been rated | VGC
‘Project 2021B’ classified in Australia…

Titled ‘Project 2021B’, which is likely a codename for an unannounced title, the game was classified M (Mature) on June 28.
Among the consumer advice section of the classification, the ACB lists “online interactivity” as a feature of the game.
In January of this year, the ACB rated ‘Project 2021A’ from Id Software and Bethesda. Two months later, the game was confirmed to be Doom 3: VR Edition for PlayStation VR.