Looks like a second Campaign Book is on the way for Memoir '44!

Days of Wonder's site has a link to order a new campaign book. It says there are 11 different campaigns involved, which is similar tot he number that were in the first campaign book. There's no mention of any "Grand Campaign" rules however and the breadth of campaigns mentioned int he write-up would seem to preclude the kind of links seen in the first book.

This looks like a nice product and it's definitely on my list.