HBO's release today of a re-edited Season 8 trailer has renewed fan calls to film a new series finale ending. But that is very unlikely to happen since the cast and crew have moved on to other projects and there's no practical way of bringing them together, says James Hibberd, who wrote the Game of Thrones book Fire Cannot Kill a Dragon. But he adds: "That said, there is one way that, hypothetically, a new televised ending for Jon Snow, Daenerys Targaryen and others could happen. George R.R. Martin's final two books in his saga, The Winds of Winter and A Dream of Spring, will have different endings for many characters. After both are published, one could imagine HBO being tempted to do something with this new and presumably creatively unique material since the company owns the rights to A Song of Ice and Fire, and is working closely with Martin, and has been very aggressively expanding its Game of Thrones universe to make HBO Max more competitive in the streaming world." ALSO: Taylor Swift acknowledges Sophie Turner as Queen of the North.