Like everyone, I am very interested in when Twelve Months Releases. I know that it is listed on the Publishers website for 1/20/26, but that seems a little off since we have not had an official announcement from the author or his website. I did a little digging to look at what his most recent books did in terms of dates (note: no battleground because of the whole duology thing with Peace Talks).
Book Off to editor Release Date Announced Cover Announced Date Released
Cold Days 4/4/11 8/18/12 8/18/12 11/27/12
Skin Game 12/19/13 12/16/13 5/27/14
Peace Talks 07/22/19 12/17/19 01/16/20 7/14/20
Twelve Months 2/19/25
Olympian Affair 3/21/23 04/20/23 05/25/23 11/7/23
Unfortunately, after looking at the data, the January date may be more accurate than I first believed. Olympian Affair had just over 7 months from off to the editor to the release date, but that was on the short side. Cold Days was a year and a half. I could not find the off to the editor post for Skin Game, but based upon the other dates I would estimate around July of 2013 which puts the total time at 10 months. Peace Talks was right at a year between editor and release date. The release date on the publisher's website may only be a placeholder, but it looks to be a fair guesstimate given his most recent releases at approximately 11 months after he sent it to the editor. The release date and cover art look to be announced fairly close together historically roughly four to five months after the book goes to the editor. That possibly means a July to August announcement.
I personally hope that this book is closer to the Olympian Affair schedule, but given that it took so long to write and is very different than his usual Dresden Files Book I am preparing myself for a 2026 release.