12 Matches right. 3 vs Ireland, 6 in Rugby Championship and 3 tests in October/November.
I fully expect South Africa to sweep Ireland. Ireland peaked a couple of years ago, and have injuries for the tour. They have a poor away record as it is, and in South Africa I can't see them winning a test even against a new look South Africa.
The Rugby Championship will be interesting this year. Los Jaguares are looking disappointing in Super Rugby, and I can't see Argentina having a successful rugby championship this year. They'll fancy they can beat SA and Australia at home, but I wouldn't be surprised if they end the tournament having lost all 6.
Since New Zealand are clear favourites a pretty safe guess is South Africa end up with 4 wins. Beat Argentina home and away. Lose in New Zealand. Beat Australia at home. Then win 1 and lose 1 of Australia away and NZ at home, just not sure which!
Similar logic for the autumn internationals. The boks will beat Italy, and they have a great record at Twickenham. But the most likely outcome they end up winning 2 out of the 3 tests and losing in Cardiff or at Twickenham.
A long way to go, we shall see, but I'll go for 9 out of 12 and I doubt I'll be far off.