More info from the latest White Dwarf! It appears that GW is coming out with a new IA book specifically for flyers. They had done a game called Aeronautica Imperialis a while back, but I don't think this is a book for that. (See rumors on Dakka).
Usually when FW comes out with a model they come out with the experimental rules, then come out with a book later on that has the real rules for it. They did this with the Achilles in the Badab War books, with the Caestus Assault Ram, etc.
I believe this book will have the real rules for the Storm Eagle in it, plus perhaps others! I hope with this version of the Storm Eagle it is better priced points-wise. The information for it was in the Forge World advertisement area of the new WD, and it was tiny... so maybe a lot of people will miss it. I'm super excited if this is indeed a FW flyers supplement! Click to embiggen the photos:
EDIT: Forge World has commented on this on Facebook:
Forge World Keep your eyes peeled for a newsletter in the next two weeks, Michael, and all will be revealed..