If indeed Tanak returns to Ford, he's driving for the main M-Sport Ford squad no doubt. They may send a Puma to M-Sport Poland and back RedGrey into a separate entry for Solberg with Monster as the main sponsor.
So, it goes something like this;
M-Sport Ford WRT
Tanak/Greensmith (full season)
Loeb/Loubet(shared 3rd car/option for 4th)
Monster/RedGrey/M-Sport Poland
Oliver (full season?)
Huttunen and/or Fourmaux (WRC2 and selective Rally 1 entries)