We have had conflicting information as to why and what is going to happen with the KAZA UniVisa, but the bottom line is that tourists will not be able to get a Univisa in Zambia at this time. It is still available in Zimbabwe, but seeing as how there is a limited supply, these will most likely run out in the near future.
An official at the Victoria Falls Border Post said that the four ports of entry in Zambia (Lusaka and Livingstone Airports, and the Livingstone and Kazungula Border posts) that were issuing the UniVisa, have stopped while the project goes under review. However, Zimbabwe is still issuing and using them at Victoria Falls Airport, Kazungula Border (with Botswana), Harare International Airport, and the Victoria Falls Bridge (Zimbabwe side).