That's a theory I see a lot of people having but I'm not sure it will happen. Africa does not have the stable governance of Asia nor the infrastructure to support the rapid industrialization that China went through.
When it comes to transportation cost it would depend on oil prices going forward.
I would guess that China will provide infrastructure to some african countries in exchange for raw materials. Political stability will also improve as China will support the regimes regardless of lack of democracy.
When it comes to transportation cost it would depend on oil prices going forward.