Although only two adventures are included in the book, this does not mean that Nefertiti Overdrive encompasses only those. The second adventure ends (hopefully) with the recovery of the Icon of Amun, but that Icon still needs to get back into the hands of the House of Kashta.
After the two introductory adventures, the book will have a discussion of where you might take a campaign. These are presented kind of as idea paths, what event could lead to what scenario, and how the NPCs might react to this. The campaign discussion will follow three broad paths: the retreat to Kush, underground opposition to the Assyrians, and taking Egypt back.
None of these are historically accurate. Heck, none of Nefertiti Overdrive is historically accurate! I just keep needing to mention this as Centurion: Legionaries of Rome was painstakingly researched and attempted to provide real-world history and individuals. Nefertiti Overdrive is almost diametrically opposed to that.
You can expect the Nefertiti Overdrive Kickstarter to begin on Monday, 17 March 2014. Get the word out!