Gabon: Who will succeed Omar Bongo?

Omar Bongo and Gnassingbe Eyadema were both born in 1935. They came to power 32 years later in Gabon and Togo respectively; Bongo through constitutional succession, Eyadema by grabbing power in a coup d'etat. Eyadema died in office on 5 February and a few hours later his favoured son, Faure Gnassingbe, seized power with the backing of the army in defiance of the constitution. What would happen in Gabon if Bongo, now 69 and apparently in good health, were suddenly to depart from the scene?