Lobster Johnson volume 4

Hi everyone,
I'm rather confused about an announcement made on the Dark Horse Comics Twitter page. It says that Lobster Johnson Volume 4 hits "FOC" Monday. What does that mean? Does that mean that the book is for sale now? I don't think it's supposed to come out until December.
If anyone knows what that means, please let me know.

F.O.C. is [URL="http://www.newsarama.com/2675-what-the-foc-how-final-order-cut-off-affects-the-biz.html"]Final Order Cut-off[/URL]. It's for retailers, not consumers. [I]Lobster Johnson[/I] Volume 4 will be on shelves in December as planned with a 17-page sketchbook section.

Oh, OK. Thanks for the help.