I'm not one to advocate exploiting encounters, but at least it was done on the PTR so that Blizzard can fix this before the patch goes live.
The EU-Kazzak guild Forte defeated Archimonde last night, during a trip to the PTR to test out Hyjal. There was apparently an exploit that's possible to avoid certain parts of the encounter, and Forte used this to their advantage to check out the loot Archimonde would drop. It's also important to note that there WAS a scripted event that took place that brought about Archimonde's death; this wasn't a "let's spit on lore to give raiders something to do" situation.
You can check out the loot below-
- 2 Tier 6 Helm Tokens
- Cloth Healing Legs
- Leather Melee DPS Chestpiece