Well well well, now that season three episodes one and two are upon us, the flood of fan-fiction is imminent.
Predictions of the fan-fictions include:
Shipping... yess, all the shipping.
Mainly, however, with Luna, or for a better effect, Nightmare Moon. I mean, 1000 years apart, really? Anywho, I suspect at least one or two stories shipping Sombra with Luna, and having him convert her into Nightmare Moon.
Self Inserts to the Crystal Kingdom
Inevitable... enough said