I'm not sure this is new, but it's the first time I've seen it. (Probably not new then.) I'm having a very good month on Apple via D2D so I went looking at my books on Apple (which got stuck by the way) and wound up here, eventually. I think for my next book I will try uploading directly to Apple, maybe upload the Book 1 to my WIP there as well, get the preview sample in there.
https://partners.applemediaservices.com/content-partnersThere's also a section on badges, which I guess means they give you a button for your book which you can place on your website. Maybe you can even place the button in the book (after the preview for the next book for example)
I haven't tried applying to be an affiliate yet, or getting any of their badges, but I'm interested in any tips/experiences people have if you are willing to share.
Thanks, Amanda