Because we haven't had enough excerpts already, I found something in Danish and a kindly redditor translated it. https://www.reddit.com/r/asoiaf/comments/9xqs27/spoilers_extended_anyone_know_any_danish_another/
It concerns Jaehaerys finding out his daughter slept with three separate men (Jonah Mooton, Roy Connington, and Braxton Beesbury) and how he promptly went all Bryan Mills on them. Other details include what I think is the tourney that Ryam Redwyne and Clement Crabb drew in, the aftermath of Maegor's reign (Benifer seems to remain Grand Maester), and the Aegon's Conquest/First Dornish War excerpts we've already gotten. I can make out references to some new characters- the oddly named Prentys Tully, Alaric Stark's heir Walton (named after the Moon King), and (I think) a new Kingsguard who served alongside Lucamore Strong called Lorence Roxton.