At around 45:30 in the most recent Twitch stream, the devs essentially confirmed that there aren't going to be any new companions added to PoE2. It also doesn't sound like any sidekicks will be upgraded to full companions given their reasoning:
This is disappointing. Given that PoE1 started with 8 companions and ended with 11, I think it was reasonable for players to expect at least somewhat similar content additions when making their decisions to buy PoE2 (I know I did). I would understand if the companions in Deadfire had significantly more depth than they did in PoE1, but that hasn't been the case unless you count the (imo) relatively meaningless relationship system which seems itself to be a big factor in precluding new companion content.
From what I've seen so far, I would take a major content pack for new and existing companions over the entire Seeker/Slayer/Survivor DLC any day. I really wish Obsidian would get that rich/expansive party content is part of what draws many CRPG fans to the genre and that this aspect of their (otherwise excellent) games really needs some focus/improvement.
Edited by Purudaya, 13 September 2018 - 07:47 PM.