Why Apple remains king of the mobile game

FORTUNE The tech worlds attention will turn to Apple headquarters in Cupertino, Calif. Tuesday, where the company is rumored to debut the enhanced high-end iPhone 5S and the lower-cost iPhone 5C. Other devices, potentially the long-rumored iWatch, could also be showcased. While new Apple products at press events multiple times a year are now common in the cutthroat mobile industry, this weeks event is especially important for Apple AAPL and its investors, as well as for the companys rivals like Samsung, Microsoft MSFT, Nokia NOK, Google GOOG, and Motorola.

The loyalty of Apple users is at stake, both the geeks as well as regular consumers, said Peter Warman, founder of research firm