Larry,
I've been in book publishing for 37 years. Traditional advertising outlets have dried up and one of my current research jobs is to identify websites to promote the books my company produces. As far as Luftwaffe related subjects, I'll assume for the moment that this has not been done in a comprehensive way. Yes, word of mouth is the best advertising but actually announcing new titles as done here is not always consistent. And some books - not this series - have outlandish or incomprehensible titles which might be known only to a small number of enthusiasts. I recommend the publisher contact Stone & Stone
http://stonebooks.com/ and announce their new, upcoming release, and alert them to the fact that the first three volumes will see substantial revisions.
Also, there are Luftwaffe sites on facebook. Perhaps FalkeEins could mention the new book also
http://falkeeins.blogspot.com/