In the developer blog, they finally reveal the last set of playable buddies. You can read their descriptions here:

Ubisoft has agreed to do another Q&A with the community. This time they will answer questions about the game, the decisions that have been made and the way they designed it.

We will be taking the 5 best questions (or a form of them) and will submit them to Ubisoft. Ubisoft will then take the best questions from the community fan sites and answer them in a video.

Please try to avoid asking questions about debugging like “will this feature be fixed”, because the Far Cry 2 team is currently working on a lot of them and will give you this kind of information through official patch notes and statements.

Ubisoft released part 4 of their trip into Africa. You can watch it here.