My opinion is that the books visible in the photo are put on that desk on one single purpose - just to raise our speculations. I would not take these books as any hint. There are books on Italian and French aircraft, the third one seems to be the bible on the Austro-Hungarian aircraft by Grosz, Schiemer and Haddow- all on the subjects up till now omitted by WNW. And simultaneously - dreamt of by many of us. I bet, they truly did it just to make fun of us reading our wildest dreams.
Still so, let me dream, even if it is only to please the WNW team Why not - they deserve it for all they have done to us in past years.
My dreams: Spad 13, Albatros D.III Oeffag and Hanriot HD.1. But above all - my wildest dream is Friedrichshafen FF.33.
I'd be shocked if the books were planted merely to play with modelers or intentionally mislead in some manner.
This is a little, understaffed company and I'm sure everyone is quite busy. I doubt they have the time or energy to dedicate to covert ops, but what do I know?
If the books represent what they are actually working on, that's great!
They are way overdue for more French and some Italian subjects.