The book is finished, and available at most major ebook retailers. It’s still working its way through the system at Kobo, and Smashwords hasn’t fed iBooks yet, but it’s coming.
More details at the FM:SE page on my web site.
Working on print this week.
Did I read correctly that you did one of these FreeBSD Mastery series on Specialty Filesystems? I can’t find it anywhere to purchase. Is that a guess that it wasn’t released yet? In Storage Essentials it sounded as if it was a done deal.
FMSF will be pretty early in 2015, writing it now. I think the afterword gives the year, my apologies for any confusion.