So, Games Workshop released its Death from the Skies booklet, changing rules for several common and popular fliers in the game of 40k, adding them to codices, and only selling it direct order ... plus, selling it.
It's like an errata you have to pay $30 for.
The NOVA will be handling this by incorporating the new rules changes into the NOVA FAQ. You will not need to own a copy of Death from the Skies or an IPAD in order to use the new rules. Because that would just be terribly inconsiderate toward a customer base.
The NOVA FAQ gets printed and put in everyone's full-color guidebook, so you'll have the updated rules with you whether you want to or not!