There is a new update to the Drake's Drum website which includes the addition of password accessible content.
It consists of Annex 19, which is a complete Drake's Drum timeline and an Interlude chapter which was an attempt at comic relief, but didn't really propel the plot forward.
If you would like to know the password please email me with a picture of your copy of either the paperback version of Drake's Drum: Horizon of Our Hopes or a picture of the screen of your reading device with the map of Africa that is printed near the end of the penultimate chapter. My email is available in the 'Author' section of the Drake's Drum website and there is a link in my sig line. Please allow a day or two for a response.