This week's Patch 10.2.5 PTR build introduces new Night Elf cosmetic armor and weapons including backpack & bedroll cloaks, a few weapons, a shield, and a few off-hands.
The new models do have cosmetic items associated with them meaning you'll likely be able to collect their appearances in the near future.
Violet Kaldorei Bedroll & Blue Kaldorei Bedroll
Violet Kaldorei Backpack & Blue Kaldorei Backpack
Kaldorei Bow Carver
Night Elven Spear
Night Elven Shield
Kaldorei Sentinel's Spyglass
Violet Kaldorei Pouch & Blue Kaldorei Pouch
Night Elven Horn & Night Elven Signal
It remains unclear how players will be able to obtain these new appearances, but 10.2.5 PTR Development Notes did suggest that the Night Elves are working on contructing their new home of Bel'ameth. Perhaps these new cosmetics will be obtainable as part of a questline in this new area?