When asked if the tentative April 2010 release date was still within the realm of possibilities, here's what she had to say: "We do not have any pub date for Rothfuss, and won’t until the book is nearly perfect. I have no idea how long that will take."
Whether Rothfuss can achieve perfection for a spring 2010 release date remains to be seen. Which means that this one could be published later on next year. . .