As much as I am DYING for a prox chat or instant voice communication in fireteams, my bet is they are not implementing it. Especially because they haven't announced whether it will be implemented or not. And here is why. I know that a lot of players didn't buy Titanfall because of the simple fact that they didn't have private lobbies (myself included). So Destiny knows they would probably get a lot of hate if they announced they didn't implement prox chat. They would also probably lose a lot of potential buyers. So they are better off letting people guess, and then finding out AFTER purchasing. If they did implement prox chat, they probably would have announced it. However, as a side note, they could also loose potential buyers who DON'T want prox chat, so there fore would not announce Prox chat even if it is in fact being implement. The chance of that is much less likely though. And for these reasons, we can't make any absolute assumptions, though the odds are not in our favor. You also now know why they haven't told us wether prox chat will be implemented or not.