The Pikeman's Lament.
It's now available to pre-order on Amazon, and presumably in many other places too. The cover shown is just a mock-up, not the final one that Osprey will use, as that is an original piece of art specially commissioned for our book.
Please note that where is says 'written by a leading games designer', it presumably means me. That is not my own description of myself, don't worry! I know my place in this life, and it is not a 'leading' anything.
Publication is in January 2017.