Quote Originally Posted by Beckett View Post
I forgot all about the evil Qiqirn tribe. I definitely think we'll get primals from them and the Namazu, as well as the inevitable Shinryu EX.

They set up a rematch with Yojimbo pretty hard at the end of Kugane Castle. He'll definitely return in some form, most likely as a trial.

Doomtrain was actually mentioned by name in a 2.X cutscene. It's a Garlean train that goes between the Castrums.

While there are definitely still beast tribes left who haven't summoned primals, SE doesn't necessarily have to use them to introduce new primals. There's precedent for "natural" primals in the game. Odin doesn't have any known ties to any existing beast tribe or peoples.
Doomtrain was never mentioned. It was established in 2.0 that there's a phantom(in this case meaning hidden) train that runs between Castrums Oriens and Meridianum, and is capable of moving an entire army at once. The Eorzean Alliance blockaded the tracks so that we wouldn't be overrun by reinforcements during our attack on the latter.