Just my two cents, but the way I see it, the two Phil/Paul WP Handbooks and the Gallery were essentially labor of love projects, attempts to create the ultimate compendium of all technical information pertaining to Wackys. The two Abrams books were good supplements in terms of highlighting the art and purely visual appeal of vintage Wackys. So rather than trying to create the ultimate reference yet again, why not focus on the nostalgic angle for an anniversary book? Anecdotes and recollections from the artists and creators, unusual stories behind specific titles, personal stories from fans, etc. Back in the early days of Greg's forum a lot of fascinating stories were told - much of that would be worthy of inclusion if it could be researched and recovered (I'm sure some of it comes from collectors who have since dropped out of sight). Round it out with some new images of latest new vintage finds (wrapper rolls, sheets of uncut/unfolded display boxes, rough sketches, C+D letters, etc.) and ephemera, and I think it could be a really fun read.
I've noticed a sharp increase in the number of books written in the "oral history" format, which I guess is more or less what I'm describing.