Heard that you will not be able to chat in game (with 40, it's probably better that we can't). Of course, at 40 players, or even 25, party chat is impossible, unless broken up. This then spirals into a problem with cautions being called by the driver. There is Skype. As for me, it's more important that I be able to hear my spotter than 25 opponents who may become chatty. Maybe there is some way to make cautions visible, as in a chat function or something akin to it. Otherwise, I may have to just rely on observation of others.
On another note...will multiplayer have custom setups?