Rolling Thunder sequel

Looks like Varely is planning on a sequel, making it a four book
series instead of a trilogy.

http://www.scifi.com/sfw/news/sfw_news_20080317.html

"
...Varley said that Rolling Thunder was his easiest book to write. "The
words just spilled onto the page, as fast as I could write them," he
said. "I write about people I'd like to know. I really wanted to know
Podkayne, and I'm happy that I'll be able to spend some more time with
her in the fourth and final book of the series, Dark Lightning."
"

I actually would be happy with it ending where it is now, but that
might be because I'm ready for him to move on (I want to read
"Irontown Blues" !).