I don't know if this is old or not but...
Nightelf mages in Cata?! wait, what o.O ... didn't they outlaw the practice of arcane when adopting druidism, and didn't all users of arcane magic be punished by DEATH, and didn't the elves known to use arcane magic be exiled?! (Of course this is how Qual'thalas and the Highelves came about)... There is also a lot of crap that happened to nightelves because of arcane magic, no matter the lore reason i don't think they would adopt it...
Mistake me if I'm wrong... or tell me to stfu if this has been posted before ;D
EDIT: Sorry, i know now... I've only been reading into cata this last week after an extremely long absence from the Lore -.-