Eye colour options will almost certainly be available and varied for the "normal" eyed races (humans, gnomes, orcs, dwarves etc) but I'm a little worried the likes of blood elves might be considerably more limited and customisation time might be invested in other areas (body markings, hair etc).
I have a sinking feeling it might be the current two colours but no longer limited by face option. Just because of how much work they seem to be doing already on tweaking magical eye glows.
I'd love for there to be an eye colour option for every form of magic a Thalassian might use though. Pyromancy orange, arcane purple, a retro white/blue for non-magic users and many others. I'm keeping my fingers crossed!
And yeah, if blood elves don't get blue, I think it will almost certainly fuel the
"high elf of the gaps" thinking.