No problem in disagreeing with me. I'd like to see everything for everyone, but, reading Blizzard's motives behinds its actions, I try to predict things based on likeliness. I find it unlikely that they'll copy/paste the hair and jewelry. I'd love to see at least some ported between blood and void elves (many blood elves wanted some non-tentacle void styles). But, I think Blizzard is more likely to try to differentiate the races further. Also, I think the hair colors for void elves will be ones that do not clash with void elf original skin colors.
If I'm wrong and we end up with more than I'm bargaining for, great. I just don't want to raise expectations and be disappointed later.