I think blind tests will be very interesting.

For me, in my experiments with it so far, where it falls down is in accurate or original descriptions of sensory details. It fully acknowledges that it can't, for example, hear... so it can't experience music/sound in the same way humans do. It experiences sound as patterns of data. It has an entirely different understanding of what senses are and what they mean to humans/how humans use our senses to make sense of the world.

No doubt, it will be able to mimic a lot of this stuff pretty well... maybe within just a few months. But metaphor involving sensory detail is going to prove tricky for it. I believe metaphorical language, particularly when sensory inputs are involved with that metaphor, will be the clearest point where we'll be able to identify a rift between AI-written literature and human-written literature.