Merithra, Ysera’s daughter, has a new Visage Form in the Dragonflight expansion and it turns out it’s not her but Ysera depicted in the loading screen.
In the Dragonflight loading screen, we see the 5 aspects, namely Alexstrasza, Wrathion, Nozdormu, Kalecgos, and Ysera, not her daughter Merithra as I had initially anticipated.
Merithra has a Night Elf Visage Form in the Dragonflight expansion, which does not line up with the Elf we see on the Dragonflight loading screen.
You can read more about Ysera in Dragonflight here. Please note the post contains major spoilers that were not available for testing on the Beta because Blizzard most likely wants to hide portions of the story away from players, just like they did with Calia Menethil.
Back in August, we covered a mysterious empty area on the map of the Dragon Isles. For further reading on Ysera in Dragonflight, you may also want to read the following post.