It's been at least one year and the voice chat is still disabled on Linux because of a game-crashing bug (as indicated by the -novoicechat launch option, which is set after the start).
What is taking so long?? This makes the game totally unplayable with strangers as you're not even told if someone is speaking (the speaker icons on the top left), instead we're getting a dark theme.
The corresponding twitter post seems to have been removed too.