What I expected to happen was:
The corners of a shulker's upper shell has a purple texture
What actually happened was:
The corners of a shulker's upper shell has a black texture
Steps to Reproduce:
1. Find/Spawn in a shulker
2. Look at the corner textures of their upper shell
Device NVIDIA Shield Tablet K1
Testing Conditions: Using the default texture pack
I can confirm that the shulker's texture is different to the Java version, but the colour is a much darker purple, and may be intended❓ .
Looking at the other coloured shulkers too, it seems that all of the MCPE shulkers have a darker tone of their base colours in places.
See comparison:
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