I think we've had a pretty big reveal, in an interview with George Martin, in a newly published book Fire Cannot Kill a Dragon", by James Hibberd. I guess it's more or less in the public domain at this point.
This is especially interesting to me because I've been banging on about the events at the Skirling Pass for a while; as an example of Martin manipulating time. I don't call it time travel. Martin's explanation that events in the future an affect the past, seems better to me. I wo