According to Ion in his most recent interview with Zoltan and Cinderys. Blood Elves will NOT be getting blue eyes in Shadowlands, that was dataminers applying wrong textures.
"Blue eyes don’t really make sense for Blood Elves, they’ve evolved beyond that."
They came from belfs so it’s fine, just kill the high Elf NPCs off so the alliance has zero argument for high elves and horde has none for blue eyed belfs
(Commentary): Again, my condolences to people who sincerely just wanted new customization options, and weren’t asking just to snub people who wanted High Elves as an Allied Race. Keep in mind, Ion ended that with, ‘Anything is possible in the future.’
Sounds like a typical Blizzard execuse. I wouldn’t be surprised if High Elves will eventually be a thing purely for the money they’d get from race and faction changes.
Would easily be the most profitable race they ever added to the game.