Apple Inc. has launched its latest iPhone 15 series, with significant design changes and enhancements. The new series has sparked questions about its potential impact on holiday sales. While orders for the highest-end iPhone 15 models are backlogged until mid-November, other newly launched products received a more subdued response. Apple is optimistic about the new series reversing a trend of declining sales, especially with the iPhone 15 Pro featuring a significant design shift. Wall Street estimates for Apple's fourth-quarter revenue stand at $89.3 billion, with $43.6 billion projected to come from the iPhone.