Just noticed that a new volume in the Classic Publications Luftwaffe series will be published next year, Dornier Do 215 - Luftwaffe and other Operators 1938-1945, by Mikael Olrog to be published on 15 June 2017. ISBN 1906537526, currently listed on Amazon at £63.38 for pre-order. No idea what number in the series this will be but there is a gap in the numbering for the volumes in the series published so far.