We're not yet decided on Zimbabwe. We might go through a section of the northwestern part of the country to Victoria Falls. But if conditions don't seem safe, we'll just go directly from Botswana into Zambia.
This route could change drastically depending on weather, bike problems, political situations, health problems, etc. But this is the current approximate guess.
The map below is modified from its original form, freely available at the Perry-Castañeda Library Map Collection.