So taking rumors into account it maybe looks like this:

Hyundai: Tanak, Neuville, Loeb/Sordo and presumably one other driver on at least one rally, maybe Breen and driving the R5 in the WRC2 team?
Citroen: Ogier, Lappi
Toyota: Evans, Meeke or Latvala, Rovanpera + Katsuta in "junior car" + maybe Al-Attiyah on Safari and maybe other "rough" rounds?
Ford: Suninen, possibly Greensmith and Tidemand on occasional rounds.

I don't think Citroen will retire and so Ogier will stay there, they have plenty of updates coming next year so it may not be so bad to stay there. He has a good chance as Tanak and Neuville may take points off each other. Each car has certain strong and weak events but now for Tanak and Neuville those will be the same, before they were not always fighting directly.

I guess Ford is waiting to see what happens and then take whoever is left without a drive and get a good deal from them. Maybe they could take Latvala or Meeke, whoever is dropped by Toyota.

For me the dark horse in this is Mikkelsen, I think he was doing well in the Polo (helped by the car of course) but since then he has struggled in the Citroen and Hyundai. Maybe switching to Ford he will find a car that suits him more and might be a surprise.