I had planned my next book, the fourth book in the Storyteller series and the start of a new trilogy called "Gwernin's Quests", to be called The Druid's Son.
But magic works strangely at times... whoops, wrong story. What worked strangely in this case was awen, poetic inspiration. The upshot is that I'm writing a sort of spin-off or prequel to the series, not narrated by Gwernin, about a 1st century CE Druid... to be called The Druid's Son. Gwernin's next book (when it gets finished, probably in 2013) will now have a different title: The Fallen Stones.