Amazon is listing them as being available late next January.
New Vanguard has seemed kind of hit-or-miss in terms of the quality of information in the last few years, but I'm still anxious to see "Big Bertha". And I couldn't be more excited that Osprey is taking an interest in first world war artillery at all!
__________________
“[B]ut these tanks are machines, their caterpillars run on as endless as the war, they are annihilation, they roll without feeling into the craters, and climb up again without stopping..." -Erich Maria Remarque
I am the co-author of the Osprey Book "42cm Big Bertha and German Siege Artillery of WWI." First off, I apologize for the first sentence of the book description posted on amazon.com - namely, "Big Bertha, a massive German artillery wonder weapon, terrorized Paris in World War I much like the V-weapons did London in World War II."
The sentence is the product of an overzealous marketing person. I know better and am working to get the sentence removed. Wish me luck!
My co-author and I worked very hard to cut through the mythology surrounding "Big Bertha" by using primary German and French sources, and to me, confusing the 42cm M-Gerat with the "Paris Gun" is a very basic error.