They did move some animals around after the Sunset Savanna expansion was completed back in April or May. For example, the five giraffes that used to be on the Uzima Savanna were moved to Sunset which used to have only 2 giraffes. I assume the two males from Sunset were moved to Uzima but I don't know that for sure.
We saw a lot of animals near our room in Kidani last week. At one point just after the feeding truck had stopped by there were 5 giraffes, 2 zebras, 5 ankole cattle, 3 maribou storks and a crowned crane all within view. At other times there were no animals around at all. The Sunset Savanna is so large now, the animals have a lot of room to roam so there are times when there are lots of animals nearby and other times when they are wandering around somewhere else. I didn't check out the other savannas over at Jambo House so I don't know what the activity level was like there.
The best thing is to figure out when they put the food out. You get the most activity near your room when the feeding stations have just been restocked.