There has not. The idea that part of their advertising was based around the multiplayer aspect, and that game design choices were made based on accommodating multiplayer, and yet there's no in-game chat function, is just so incredibly ludicrous and amateurish it beggars belief.
I'd actually appreciate a word from Larian on this, commenting as a non-verbal person who cannot just use a 3rd party external voice chat; How am I meant to communicate with my multiplayer friends without having to switch out of the game entirely to use an independent 3rd party chat program?