When attacking a Shulker in 15w45a, it makes the same damage sound as an Iron Golem, which is awesome. However, it's subtitle is listed as "Shulker Awaits" instead of "Shulker Hurts." This leads me to believe that there are missing sounds for Shulkers (Idle waiting sounds) and a missing subtitle for hurt Shulkers.
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[media]

Confirmed.
In the language file it's in fact
subtitles.entity.shulker.hurt=Shulker awaits
Can confirm.
Confirmed for 15w46a
Confirmed for 15w47a

relates to MC-92784

Resolving this to the more complete MC-92784