Various sources have been saying that there will be a new book for SBG. Which seems logical, the only source books still available are the Lord of The Rings journey books. None of the other "army" books are available, not even Legions of Middle Earth. The last one is important because it has all the tournament army building rules and scenarios in it. GW generally does not release much on December, although that could change, so expect anything coming to be released in January at the earliest.