Re: SPOILER *all five books* THREAD FOR Game of Thrones (TV series discussion)
I feel like George Martin confirmed the Jon Snow theory without even intentionally doing so.
He was on a talk show 2 years ago and was asked what's the R+L=J internet acronym was all about, and his response was "No Jon Snow mommy questions", except the guy didn't even know what R+L=J was about and asked nothing about Jon's lineage, so it was an interesting response.
Perhaps more importantly, at a book signing someone asked him about the theory and his response was to say he's not going to change the story just because people may have figured something out.
So maybe I read too much into that, but to me it reads like he confirmed the theory without actually realizing it. If that makes any sense.