Apple senior vice president of worldwide product marketing Phil Schiller opened up Apple's Worldwide Developer Conference (WWDC) on Monday by show casing new MacBook Pro laptops with longer battery lives, faster processors and lower prices.

Apple made the new 13-inch and 15-inch MacBook Pro laptops the introductory part of its developers' conference in San Francisco. The new 15-inch model sports processor speeds from 2.53GHz to 3.06GHz. The laptop with the 13-inch screen starts at $1,200, and the 15-inch model sells for $1,700 and up - both $300 less than existing similar models.

The company also lowered the price on its ultra-thin MacBook Air to $1,499 from $1,800. When MacBook Air was first unveiled in January, it retailed for $2,500.

Meanwhile, speculation continued that a new iPhone may be unveiled sometime throughout the conference.