Since this episode sounds interesting, I had to start this discussion.
You can give a list of theories you think this episode will be about.
"You're going to harvest me?" -Peridot
This episode might explain what Peridot meant when she did that.
I think in Homeworld the diamonds 'harvest' useless gems and use them to power objects, such as Lapis' mirror.
What do you think it will be about?