We took the Highlights of South Africa trip July 14th to August 6th, 2012 which included the post trip to Victoria Falls. We selected the month of July for better game viewing at Kruger, Addo, and Chobe (post trip), and to view Victoria Falls at mid volume water flow.
The game viewing drives were the highlight of the trip for us. You will love Kruger. The first day of game drives in Kruger is in an open safari vehicle. On the second day there is an optional "Intimate African Safari" for $120 to use the same type open safari vehicle. Or you can go with the bus which is no additional cost. All of our group except for three people did the optional open safari vehicle. The advantage of the open safari vehicle is you have a guide, the guide has radio contact with other vehicles to better locate animals, open safari vehicles can go on gravel and hard surface roads (buses can only go on hard surface roads). Also taking photos through a bus window is more difficult with glare and tint issues. For us it was a no brainer to take the optional "Intimate African Safari".
We saw the big five (leopard, lion, elephant, rhino, and cape buffalo) on the first day. We also saw many other animals including giraffes, zebras, hippos, baboons, and even the rare wild african painted dogs.
You are lucky because the itinerary changed for 2013. There is one less day in Johannesburg and one day added to include a game viewing drive through Hluhluwe-Umfolozi Game Reserve.
The coldest part of the trip were the early morning game drives which were in the low 40s. We wore layers of shirt, zippered fleece, and light jacket. Some also had gloves and hat. As the day went on it got warmer. The rest of the trip was warmer but we seemed to start out the day with the same setup of shirt, fleece, and light jacket and took things off if it got warmer.
We had sunshine most days with two late afternoons of light rain. Our Program Director said the Garden Route and Cape Town can have rain that time of the year.