Aside from the three Hildebrand trials, the two relic trials, and Odin. ARR just had a lot more trials than any of the expansions.
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Hildebrand Ultimate when?
We got this already back at the end of SHB with the 'Lunar Primals' Fandaniel summoned with his tempering towers (Lunar Bahamut was the final boss of Pagl'than, and we fight Lunar Odin, Lunar Ravana and Lunar Ifrit on the plains of Carteneau in the final solo duty for patch 5.5, so presumedly the other Primals got Lunar versions too, but we never saw them). Of course nothing is stopping SE bringing them back, but given they were specifically created by Fannyboy's tempering towers, which... disappeared once Anima was destroyed inside the Tower of Babil in EW, I doubt that would really be possible.
This is actually the raid we're next getting, it's called 'Myths of the Realm' and apparently will be dealing with the origins and true history of the Twelve, which is Eorzea's pantheon. (those figures on the map around Garlemald are probably just embellishments meant to say "here be dragons" and probably aren't meant to be taken literally, just like that rocky floating continent that totally isn't Elpis floating northeast of Garlemald on the map). Having said that, SE could expand it to include the myths of other lands like say Thavnair, but I think it's pretty clear they're going to stick with Eorzea for that one.
Aside from the Four Fiends and the Four Archfiends, how many other mini-boss squads have yet to appear in XIV in some form?
Prediction: Full Throttle, Machina Maw, Floral Fallal.
Only half kidding.
I am actually getting a vibe like the trial series might be FFXIII bosses on the First.