Marchant de Lange of the Nashua Titans, a test match find against Sri Lanka, is again included in the test squad and will get the chance to show his worth for the first time at Twenty20 level.
Two stalwarts, Jacques Kallis and Dale Steyn, will be rested for the T20 series but will play in the other two formats.
"Ontong fully deserves this latest call-up,'' Cricket South Africa selection convener Andrew Hudson said. "He has shown outstanding domestic form this season and I believe he has developed into a more mature cricketer. His finishing ability was a key factor in the Cobras' success in winning the 1-Day Cup.''
"He is the complete limited overs package, being a fine batsman who will strengthen our fielding disciplines and also give us another bowling option.
"Having AB de Villiers fit again for T20 action also gives us a lot more flexibility and better balance.''
Rory Kleinveldt and Dean Elgar, who were both selected for the one-day series against Sri Lanka, were not considered because of injury.
The tour gets underway with a Twenty20 game against Canterbury in Christchurch on February 15, followed by three Twenty20 internationals, three-day one games and three tests against New Zealand.
Test squad: Graeme Smith (captain), AB de Villiers (vice-captain), Hashim Amla, Mark Boucher, Marchant de Lange, JP Duminy, Imran Tahir, Jacques Kallis, Morne Morkel, Alviro Petersen, Robin Peterson, Vernon Philander, Jacques Rudolph, Dale Steyn, Lonwabo Tsotsobe.
ODI squad: AB de Villiers (captain), Hashim Amla (vice-captain), Johan Botha, JP Duminy, Faf du Plessis, Jacques Kallis, Albie Morkel, Morne Morkel, Justin Ontong, Wayne Parnell, Robin Peterson, Graeme Smith, Dale Steyn, Lonwabo Tsotsobe.
T20 squad: AB de Villiers (captain), Hashim Amla (vice-captain), Johan Botha, Marchant de Lange, JP Duminy, Colin Ingram, Richard Levi, Albie Morkel, Morne Morkel, Justin Ontong, Wayne Parnell, Robin Peterson, Rusty Theron, Lonwabo Tsotsobe.