After seeing this on TMP ... and growing up on numerous Planet of the Apes movies, show & cartoon plus reading the book ... I made a suggestion. ÂÂ
  So this may never come about, but if they look anything like the bigger scale pics, they might make good Orks painted green.  Or just Frakk'n Big Evolved Apes with Guns !  Could be Tau Allies, Human allies like Ogryn, allied with Feral Orks, or just the Indig pop of some far flung planet ...     TMP                                                                                                                                                                                                                                                                                                                                                                                      "Beware the beast Man, for he is the Devil's pawn. Alone among God's primates, he kills for sport or lust or greed.
Yea, he will murder his brother to possess his brother's land.
Let him not breed in great numbers, for he will make a desert
of his home and yours. Shun him; drive him back
into his jungle lair, for he is the harbinger of death."
Cornelius reading from the Sacred Scrolls
Planet of the Apes (1968)
 And even Stargates on many planets ...   It's a BIG universe ... a lot of "Stuff"/