So the TV show has all but explicitly confirmed R+L=J. Last night we had that "blink and you'll miss it" statement that some prince named Rhaegar had his marriage secretly annulled so he could marry some other gal. (love how the show played that relevation down by having Sam's rant about windows and shits prematurely end the reveal)
I'm sure it'll turn up that the book Gilly was reading from is one of the books Sam stole when he fled the Citadel. That's *got* to be a Chekhov's Gun.. we'll absolutely see that tidbit of information come up again. Presumably so that Jon can not only learn of his parentage, but also of his true-born status. Uh oh Dany... someone's got a more direct claim to the throne than you! The show ditched the Jon Connington storyline from the books, but it looks like we're still on course to seeing Dany clash with the notion that she's not the direct successor to the Mad King afterall.
Oh and Cersei's preggers! I'm gonna predict that I think it's actually true and not a scheme of hers to keep Jaime wrapped around her finger. It *could* be a scheme, but I think she's able to manipulate Jaime just fine without such shenanigans and what's more, I think she *knows* she can manipulate Jaime without such shenanigans. Of course Maggy's prophecy says she'd only have 3 children, so a 4th should be out of the question. But the TV show already suggested that she DID have 4..in one of the season 1 episodes Cersei admitted that she killed one of her own "dark haired" kids that Robert actually did sire with her. It hasn't been referenced since, and she might have been lying about it, but still. From her own mouth she's had 4 kids already. Regardless, I doubt the series has 8 or 9 more in-universe months left to go in the story. Cersei is almost guaranteed to be dead by the end of the series, and if she really is with unborn child, it'll make Jaime's killing her all the more wrenching ;)