Halo: Glasslands, the novel first announced all the way back in 2009 (remember Dollhouse? No?), is now filling the shelves of your favorite book seller. The book promises to continue the story of Ghosts of Onyx, and will detail events that take place after Halo 3. The press release mentions plenty of plot details, though frankly, none of them match up to the torrid love affair suggested by the Glasslands cover.
Granted, there probably isn't an actual human-on-Covenant relationship in Glasslands, but that's what fan fiction is for, right?