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I have watched some hands on reviews as well, no AR app but it doesn't mean it won't have the option.
@almirsahbaz@Viridis according to Sony's site:
http://www.sonymobile.com/global-en/products/phones/xperia-x/specifications/
Check down at applications, AR effect is listed. Not sure about 4K.
@Viridis That's true and looking at all the specs available, they don't match. So we have to be ok with what we have for now.
According to the specs it only says full HD recording. If you read the specs of the Z5 and Z5 Premium it says 4k video recording.
The main camera in Xperia X and Xperia X Performance does not support 4K video recording.
I'm afraid i don't have any information regarding the background for this decision so i can't say. I can only share the information i have.