Guest types are apparently back which is cool, but I highly doubt that individual guests will ever make a return. I'm honestly alright with that, individual guests bugging out or just ignoring your facilities and decreasing your overall rating as a result was always annoying in Zoo Tycoon and JPOG. I've heard a decent compromise between the two systems would be to have a VIP system, where only certain guests are individuals with names while the rest are filler and just a visual representation of your population. That way you still have some people you have to manage, but it's not like you have to make sure your several thousand guests are individually accounted for which would be a complete nightmare, and the penalty for a VIP dying or just having a bad day would be a lot more severe. It probably won't happen, but it would be neat to see.