From upcoming patch notes:
Siblisian Berserker Cloak should be more likely to be seen in game. The rarity of the drop was not affected, but the chance to see one instead of a Stormwood Battle Staff was updated by taking the ratio of recorded staff drops to cloaks (very slight), and kor shamans were underrepresented in the spawn table due to a smaller level range
This means it can drop before the next patch, it's just very unlikely.
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