Yoshida doesn't mention anything like this during Meoni's interview either. At least I don't remember hearing anything like this yesterday when I watched it.
The live letter from an age ago showed viera with one of the unlockable hair styles. From what Yoshi P has said the viera can look forward to more hairstyles but the horthgar is another matter.
If the past is true.
No, heres more hats you can't wear, more hairstyle you can't use.
In one of the NIN pics the Viera has a new hairstyle so I think it's pretty much confirmed that they're getting some more in Endwalker.
I'm very pleased and excited about this. It's my hope that all of the unlockable hairstyles will be available for male and female viera, since Yoshi-p said viera would get more hairstyles and hrothgar would get more on 6.1, 6.2 and onwards. So it seems they'll do it for viera in time for launch and hrothgars will be a work in progress. But this makes me very happy. I thought hrothgars would only be able to change their hair in 7.0 along with female hrothgar but it being in 6.1 surprised me!
From whats been mentioned by those that got to play around on the test server during media tour there is a new hairstyle for both m/f veria that wasnt on the benchmark. Sooo theres at least 1...