We previously datamined several HD Quel'Serrar models on the Patch 10.2 PTR, and the latest build has added Arsenal: Whispering Temple Blades, an item that grants the cosmetic appearances of the gold-tinted version.
Vanilla and classic players will instantly recognize the nostalgic weapon, Quel'Serrar, as it was a one-handed tanking weapon acquired through completing a a difficult questline.
Original Quel'Serrar Model
The new account-bound Arsenal: Whispering Temple Blades allows players to collect the new HD appearance in both a version that includes a shimmering particle that circumscribes the blade (Gleaming Whispering Temple Blade) and one without the effect (Whispering Temple Blade).
HD Quel'Serrar Model from Arsenal: Whispering Temple Blades
Shimmering Particle Effect of HD Quel'Serrar
Even though we now have items attached to this iconic appearance, we're still unsure how these items will be acquired by players. Without a Trader's Tender cost, it's unlikely we'll see this appearance from the Trading Post but doesn't that doesn't completely rule it out. It's possible that we could see the appearance be obtainable from an encrypted questline in 10.2 or even something related to the 11.0 expansion speculation.
Additionally, this new arsenal appears to only grant the golden version of the blade leaving us to speculate about when/if we might be able to collect the other tints.