Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.
5.9 / 5.10 The Thirteenth Floor (partial synopsis of opening scenes only, with Russell T Davies indicating that the storyline is to be reused for an episode of Wizards vs Aliens and so could not be revealed)
5.11 / 5.12 The Battle for Bannerman Road (general description only, as the episode had not yet reached the outline/storyline stage at the time of Sladen's death)