https://i.imgur.com/qTqFyxO.png
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Please SE!! I'm tired of looking at all these baby face hyurs!!
Right after Viera get hats, but right before Hrothgar can use the aesthetician to change hair styles.
It seems to be a customised face made for that character, even though it's used the generic / pre-existing-character's face as a starting point.
We wouldn't be getting it until they can (via technical issues or budget) increase the number of options made available in the character creator. There is nowhere to put it in the current format.
Yoshida literally said in a previous live letter that giving everyone stubbles would be “too hard.” And I absolutely lost it, lol. I’m not even a male character and I want it to happen, yet, it’s “too hard.” Triple A company, folks.
That's the way every face works though. Every character with the option for a beard has a uniquely-designed one built for that character model so it is, as you said, compatible with the jawline options.
The beard for Midlander face #5 (eg. as used for Ardbert in-game) isn't quite the same as the one used for the Midlander-face-#5 "generic WoL" in the trailer/benchmark. It's a custom model they've made by starting with that straight-from-the-character-creator NPC and customising it in ways that can't be accessed in the character creator*, and they seem to be unable to add new options unless they rebuild how character customisation (and everything that relies on it) works.
If they did add the trailer version, it probably would still be only for that face.
* Customised faces that just make minor alterations to standard ones seems to be a really common way for them to make unique NPCs. All the Scions have custom faces despite seemingly being straight from the character settings (presumably to add their Archon tattoos) or you get things like Yugiri who uses face #3 with the horns from face #1.