I've heard from the BWMA that hunting on private lands will be unaffected by this, it will only apply to government lands.
At the moment that's quite true but after his recent statements I wouldn't trust Khama any further than I could throw him and if you read his statements carefully, you'll notice he often refers to 'Botswana' rather than the Govt owned areas of Botswana.
I won't be at all surprised if he tries to ban hunting on private land at some time in the future.