By this time do you think all DnD, larian, BG, crpg fans have heard about bg3?
As Matt Mercer is involved they could get CR involved. Having them play the DM mode would be great advertising.
WoTC can be involved with marketing the game, they have reach and DnD beyond.
If they have done some market research I wonder how many players would buy the game but have no knowledge of the game. There would be many waiting for release, awaiting for certain details etc before deciding to buy...but that group will find out what they need without needing some marketing campaign. Also larian will look a current sales and look at what worked for dos2.
