Ternus took over from Tim Cook on September 1.
Many of Apple's biggest rivals, such as Samsung, Motorola and Google, have already come out with foldable smartphones. But Apple is not one to rush on new technologies.
"The foldable launch is straight out of Apple's playbook: Wait for the product to work out its kinks and for the market to offer glimpses of viability, then enter and shape the category," said Forrester analyst Dipanjan Chatterjee.
"The difference is that foldables still represent a minuscule share of the smartphone market. The test of Apple's ambition will be whether it can expand that niche into a meaningful new segment."
Compared with earlier generations, the iPhone 18 likely will cost more due partly to a global memory chip shortage. The iPhone 17's price ranges from $US799 ($A1,106) to $US1,999 ($A2,767) depending on the model.
Earlier this year, Apple unveiled artificial intelligence advances, including upgrades to its Siri assistant, emphasising a focus on privacy and day-to-day use as the company tries to catch up with rivals on AI.
The keynote address for Ternus at the tech giant's headquarters in Cupertino, California on Wednesday, will set the tone for his vision of Apple's future, Chatterjee said.
"John Ternus inherits perhaps the most successful consumer technology juggernaut in modern times. That is both a boon and a burden for him. Tim Cook's perfected execution, scale, and monetisation set a high bar, and Ternus must extend that run," Chatterjee said.
"But he must sustain that momentum while positioning Apple to disrupt itself in the near future, when the iPhone, or any smartphone for that matter, will cease to be the consumer's primary conduit to the world."
Last year's iPhone 17 lineup, which included a new ultra-thin model, has been selling well. That generation saw a new slimmed-down model that adopted the "Air" name that Apple already used for its sleekest iPads and Mac computers.
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