Soldiery ?

[Niwashi]

You can already buy the Soldiery gear with allied seals.

I guess I assumed that was going away the same as the ability to get Myth gear from Allied Seals went away when Myth tomes themselves went away. But I guess the patch notes didn't really say that part is happening again, and with Centurio Seals being introduced specifically for hunts in the HW regions, it's possible our Allied Seals are staying as-is.

Another option can be that they put them into the 2.4/2.5 mainstory quest rewards

That's possible, too. (I hope, though, they do it more like the i90 gear that drops as tokens tradeable for any job's gear, rather than the i70 that drops as specific pieces of equipment, whether it's the one you want or not.)

I wish I knew how it was going to be handled, though. There's a fair amount of it I'm going to want but haven't collected if I haven't leveled that job far yet. It seems like a significant enough change that it would have belonged in the Patch Notes.