Ion never said that. You are confusing what he said with what Afrasiabi said. And what Afrasiabi said was 'it's possible' before spinning off into a comparatively lengthy tangent about forum behaviour.
What Ion said was 'Anything was possible'. He said the same thing to Preach too when Preach asked about the return of master looting, and Preach took it the correct way i.e.'it's not likely at all Preach so don't hope for it' and not the wishful-thinking pro high elfer way of 'we are completely open to and very likely to change our minds if you keep complaining long enough. Please complain more'.
In regards to void elf customisations themselves, we don't know but I still reckon it is more likely than not that whatever the Void Elves get won't be anywhere near enough for the majority of those hoping for high elves on the alliance who look like Blood Elves.