When new CEO John Ternus unveils Apple's latest products on Wednesday, Wall Street expects him to show that the company can still deliver breakthrough hardware and a Siri virtual assistant capable of competing in the AI race.Analysts expect Apple to announce a new iPhone that folds open like a passport at its Cupertino, California, headquarters. They said it could quickly emerge as the category leader in the nascent folding phone market, despite an expected price of more than $2,500 and having cameras and processors that may not lead the market.The company has already announced a deep overhaul of Siri —…