I think it should be assumed the eye colours on that specific model are probably a unique consequence of that character's current status, rather than confirmation that eye colour is coming to Blood Elves. We could get them, but we might not.
Some datamining has already located the darker skin tones promised to Blood Elves. Blood Elves now have access to a full human skin tone range.
Marlamin has recently posted this tweet at
https://twitter.com/Marlamin/status/1248260384802377730
In response to the question "Does this build contain something for more races than humans?" he answered...
"I'm assuming you mean customization option wise, and yeah, tons of stuff, but barely any of it hooked up properly yet."
I presume 'hooked up' means that the customizations are loaded onto an actual character that people can easily understand via screenshot or that can be fed into the wowhead model viewer.
I believe it is likely that most customisations therefore are yet to be revealed, and given the complexity of the task as implied by Marlamin, it will likely be when the first streamers broadcast the alpha that we will see exactly what is on offer.
A complete human skin tone range was one of my desires and the likeliest one to grant. This appears to have been done. What I am hoping for now are warcraft 2 style tattoos for Blood Elves and for a wide range of eye colours, including blue. Hopefully we will soon how much of that has been facilitated.
The tattoos that have been datamined however seem consistent with the relevant races (Dwarven celtic style, Orc war paint etc.). Farstrider style tattoos are the logical place to look for what Blood Elves will be getting, should they get tattoos.