Steve Jobs ' keynote address will kick off Apple 's five - day press conference . ` ` You wo n't be disappointed [ with my keynote ] , '' said the Apple CEO in an e - mail to a friend . Apple may have spoiled the surprise by leaking a preview of the new iPhone . The conference is designed to recruit and educate developers supporting Apple 's iPhone OS and Mac OS platforms . Apple is also expected to talk about its next - generation mobile operating system .
Steve Jobs ' keynote address will kick off Apple 's five - day press conference . ` ` You wo n't be disappointed [ with my keynote ] , '' said the Apple CEO in an e - mail to a friend . Apple may have spoiled the surprise by leaking a preview of the new iPhone . Apple is also expected to talk about its next - generation mobile operating system .