There's a lot of chatter these days in the publishing industry, and most of it is not good. I'll just give you the roundabout, as most of this stuff is 'inside baseball' to readers. But any writers/authors/publishers swinging by here might be curious.
1) There're a lot of problems with reviews these days. Amazon and even Smashwords have reported scams involving companies soliciting fake reviews for authors. If you the author get caught, I hear they'll drop your books. Smashwords authors have been getting promotion solicitations in their review sections. The NYT had to pull a book from its Bestsellers list because it was gamed by the publisher or other shady fellas. You can get the 411 here.
Long story short, I think that quite a few "best sellers" may be anything but. Going forward, I can only really focus on how to improve my numbers and get as many superfans that I can.
2) Barnes & Noble has cut hardcore erotica from their collection, including necro stuff and pedo stuff. They're also cutting out hate speech and calls to real-life violence, essentially. I tend to skirt the line a bit on violence, so I must be careful going forward least my Darfur 3 Saga stories wind up on the cutting block. Does that mean self-censorship? Well, I wasn't planning on anything that they wouldn't want adult readers to read anyway, but these days, even a minor mistake can have harsh consequences.
I feel like I'll be OK, but my plans for Cutthroat Rimworld Rape Pirates are off the table.
3) Smashwords released a survey recently, talking about the top selling genres. Of course Romance is #1, but Fantasy is #3, Sci-fi #5, Horror #10 and African American Fiction is at #13.out of #17. Comedy is #17, which is a shame. In Non-fiction, Travel books are #11 in sales, so if I write in that genre, I shouldn't expect a best-seller, unless I write the most kick-ass travelogue ever.
The big sellers are also doing box-sets, so when I have 4 books in the Darfur 3 series ready to go, I'll make a box set. Gotta have a set to do a box set, after all.