I *THINK* interrogations are still a thing. I've had intelligence updates after rescuing enough enemy survivors. I didn't get a discrete event message tying the two together, though. Also, I don't think the game tracks POWS post-interrogation anymore, as I've been dropping enemy crew on one of my mining colonies and I don't see them showing up anywhere (for example, in the "stockpile" tab or as a tiny population). Kinda undermines my idea of eventually building a Labor Camp for POWs.