Africa, Africa, Africa
Keeping it really short:
Been used a lot recently, producers will most likely want to rest it to avoid it becoming too repetitive/dull
Only way is if they use unique cultures/regions, like:
1.) Ethiopia- It's East Africa, which has been used a lot recently (Seychelles S16, Malawi S19, Tanzania S20), but it's ETHIOPIA. It's a culture and a people all it's own. A revisit has been long overdue.
2.) Western Central Africa- Cameroon, Equatorial Guinea, Gabon, Rep. of Congo could all see visits. It could be the Africa that we know and love, but with a more tropical/jungle-y twist.
3.) South Africa and either Lesotho or Swaziland- The only way this will work is if they don't do the typical "we're in Africa, let's look at the poverty and the people who still live in huts! Oh, and ANIMALS!" kind of visit. More metropolitan stuff, more extreme things (world's highest bungy in Port Elizabeth), more music and culture.
Final thought: Don't be surprised if we don't see Africa this season, or maybe even next, but still keep an eye out.