Like assistant coach Ian Foster before him, Hansen predicted the Springboks would be a more dangerous outfit by 2019, having struggled in their attempts to impose racial quotas and remain competitive.
The All Blacks twice thrashed the Boks in the Rugby Championship last year, including a 57-15 thumping on South African soil.
However, all overseas-based South African players will be eligible for selection during World Cup years - strengthening their playing stocks significantly.
"We're just happy we're in a pool that'll provide some challenges," Hansen said.
"Any one of those top eight teams you pair with are going to be tough - in this case, we get South Africa, a team that knows us really well, we know them really well, (and) there's a lot of history.
"It'll be one of the games of the tournament and hopefully we both play really great rugby, and inspire the tournament to go to another level."
-AAP