My guess at the moment

Hyundai

#1 Tänak
#11 Neuville
#19 Loeb
#6 Sordo
#42 Breen (maybe 4th car on some rounds but mostly R5 development)

Toyota

#33 Evans
#5 Meeke
#10 Latvala
# Rovanpera (not doing a full season)
#17 Katsuta (not doing a full season)

Citroen

#9 Ogier
#4 Lappi
# Ostberg, #89 Mikkelsen (part time season if one of them gets chosen)

M-sport

#3 Suninen
#44 Greensmith
# 89 Mikkelsen, Ostberg (with m-sport they may do full season, depends on budget)