Looks like a fun title! I'll definitely check this out! Indeed, I don't feel that there are enough all-ages reading material and I'm sure that my students would love this title. Lunella looks precocious and clever. Indeed, I like this tagline of an Inspector Gadget who knows what's she doing.
As for what happened to Moon Boy, well, I don't think we should ignore that. Moon Boy was a part of Devil Dinosaur's history and I'm sure Moon Boy means a lot to Devil Dinosaur. I think it would be cool to bridge the past and present if he showed up in whatever capacity.
Still, this appears to be Lunella's story. Let us all be open and excited for what happens with her. I sure am.
Edit: Y'know thinking it over, part of me really wishes that Justin Seyfert and his Sentinel were still around. I think it would have been cool to see Justin and Lunella getting into a shouting match over who was better, the Sentinel or Devil Dinosaur.