From the announcement:
Based on another excellent concept from David Revoy, this series is set out to provide an in-depth look at an intense modeling workflow of a Sci-Fi vehicle. The amount of detail we will be modeling is both intimidating and exciting! No tutorial on Blender Cookie has ever reached this amount of detail.
In this series we are taking an exclusive look at modeling only, thus we will be going for more in depth than usual.
Pre-ordering saves you %25: $24 instead of $32. CGCookie estimates that this series will be released toward the end of February 2011