When does the Schweiser CFA level one book come out?

I plan to study for the June 2011 exam. I have a set of CFA's own books from 2006 and am casually reading the economics section, which is among the least likely sections to change year to year, I think. However, I'd like to purchase the Schweiser package to formally begin studying. Does anyone know what month it is typically released? I.e., does it come out in the fall before the June exam, or the January before the June exam?