Actor Lars Slind, who is playing the “faerie warrior” in an upcoming episode of True Blood has posted a couple of photos from location on his Instagram page. Spoilery pics are below:
The first is a location pic from Lake Piru, showing what looks like a lakeside settlement (straw huts)
And the second pic, the actor describes as his family.
So it looks like whatever conflict this warrior is involved in will either take place a long, long time ago, or in another (faerie) dimension. The Niall flashback could be a good bet. Sookie will probably be sitting this one out and letting her ancestors take center stage.