In the media tour there is a Japanese article that includes mention of Scholar's new Seraphim transformation and potential future lore explanations:
https://game.watch.impress.co.jp/doc...w/1593842.html

Quote Originally Posted by Game Watch
――学者がいきなり変身していて、びっくりしました。

吉田氏: 学者は「妖精食べた?!」など、色々な歴史があって、いよいよ自身がフェアリーに転身。でもデザインはバトル班とアート班が相当な回数のやり取りをして決まっていきました。ちょっと天使よりという意見もでるかもとは思っていますが、まずはじっくり触ってみていただけると嬉しいです。

――学者はいままで海兵魂!とか、結構武骨な印象だったので、落差がすごかったです。

吉田氏: 絵替わりは非常に大事なので、こういった大胆さはあって良いと思います!

――学者のセラフィム化やソルバハムートは、どちらも裏設定がありそうなアクションですが、今回それがわかるようなジョブクエストがあるんでしょうか?

吉田氏: 一連のジョブクエストは一回完結させているのと、ジョブクエストを作った場合、縛られてジョブ自体の改修に影響がでるため、本当はあった方が良いのかもしれませんが、今回用意していません。むしろ今後別の形でサイドクエストを作る時に、その中でロアが分かるようになるということはやると思います。
Quote Originally Posted by Google Translation of Game Watch
--I was surprised to see the scholar transform so suddenly.

Yoshida: The scholar has a lot of history, including "Did he eat a fairy?!", and now he has finally transformed into a fairy. But the design was decided after a lot of discussion between the battle and art teams. Some people might say that it's a little more angelic, but I would be happy if you could take your time to try it out for yourself.

--Until now, the scholar has had a pretty rugged impression, with a marine spirit! So the difference was huge.

Yoshida: Changing the art is very important, so I think this kind of boldness is good!

-- Both the scholar's Seraphim transformation and Solbahamut actions seem to have a backstory, but will there be a job quest this time that reveals that?

Yoshida: The series of job quests are completed once, and if we created a job quest, it would tie us down and affect the revision of the job itself, so it might be better to have one, but we haven't prepared one this time. Rather, when we create side quests in a different form in the future, I think we'll do one that reveals the Lore.
Keep in mind these are Google Translations and may have inaccuracies. Someone else may be able to offer a more nuanced translation.