So they confirmed the Battlefield Hub..
Battlefield 2042 has just confirmed from EA PLAY Live 2021 Spotlight – The Future of FPS that the new [REDACTED] game mode coming to BF2042 is going to contain Battlefield Fan favorite maps brought back into Battlefield2042 Gameplay. They also mentioned that the environment around will adapt and change to indicate when a world event is happening. The trees will begin to bend when a tornado is approaching.
Also tom posted
the maps I've heard will be coming to the #BATTLEHUB:
Siege of Shanghai
They will be only 2 at the release and then will be added one by one.
We just do not know if its a big open world with all the map in it or map separately