Its called halo 4.
They won't need to release a book. because they are releasing a game!!!!!! It's called halo 4 and it's not just a rumour, Microsoft announced it at E3 2011 and it's being developed by 343 industries, not bungie. A trailer of it is here: www.youtube.com/watch?v=TC2yMKMENdg
They have Halo: Glasslands