GRRM Warns the Show Plans to Kill Characters Who are Still Alive in the Books

Before you cry "they already did that!" consider what Martin says about next season: "People are going to die who don’t die in the books, so even the book readers will be unhappy. So everybody better be on their toes. David and D.B. are even bloodier than I am." (Emphasis added)  So far most of the deaths the show has added have made sense; they gave heroic ends to characters that sort of just milled about in the books until you forgot about them.  But to say the show's writers creators are even bloodier than GRRM sounds a bit more substantial.  Who do you think might meet their end on the show that's still around in the books?