It's unlikely that the B&C is ever going to have cross-platform discussion like chat or anything like that, I think precisely for the reasons November mentions, but in the absence of that there are a few rather lively 40k servers on Discord. The r/Warhammer 40k one is pretty active, and there are a few other ones too. Due to... well, quite a bit of stuff that goes above and outside of what the B&C would consider to be acceptable content (perhaps it's just my experience, but rapid chat tends to degenerate to crudity fairly quickly on Discord,) I'm not going to post any invite links here, but if you poke around the web for a bit you should be able to find some.
Edited by Soldier of Dorn, 24 September 2017 - 05:37 AM.
For the light of Sol, and the earth of Terra, we stand. For the oaths we made, we stand. For the blood in our veins, we stand.
For the stones laid by our ancestors, we stand. For the days that have passed and the days that shall come, we stand.
For the living and the honour of the dead, we stand.