I was just browsing the latest Casemate Publishing catalog and came upon a couple of beauties. First is German Artillery: 1914-1918 by Wolfgang Fleischer, which is due out in January. The other is Italian Artillery of WWII, from MMP's Green Line, out in May. The focus is obviously on WW2 use, but the description from Casemate says it will cover all the Great War designs still in use by the Italians.
Together with the Osprey WW1 artillery tactics title due out this month and their earlier release about Big Bertha, it would seem we're having a mini-renaissance of Great War artillery books!
Links:
German Artillery:
http://amzn.com/1473823986
Italian Artillery:
http://amzn.com/8363678619
No connection to the authors or publishers, etc.
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“[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