First Orc males, then Draenei, and now Night Elves? It appears that Night Elf shoulders have shrunk (just a bit-- not nearly as dramatic a change as the Orc shoulders were) over on the PTRs. We talked about this on the WoW Insider show last week: what is up with Blizzard's code that changes like this are happening? What variables are they editing that makes the weird stuff like this happen?
At any rate, there is good news. Hortus says the issue is unintentional, and will be fixed in an upcoming PTR build. So your Night Elf will still be able to wear his broad shoulder pieces with pride.