Still unknown is whether Apple will announce a smaller version of its iPad on Wednesday.
Apple dominates the market for tablet computers, shipping seven out of every 10 tablets worldwide in the second quarter, according to research firm IHS iSuppli. Rivals have been trying to compete by producing smaller, cheaper models —such as Amazon's Kindle Fire. A mini iPad would challenge those relative newcomers.
Sales of Apple's iPhones are still strong, though the company lost the lead in smartphones to Samsung this year. Samsung Electronics Co. benefited from having its Galaxy S III out in the U.S. in June, while Apple was still selling an iPhone model it released last October. A new iPhone will allow Apple to recapture the attention and the revenue.
Amid expectations of a new iPhone, Amazon, Nokia and Motorola all tried to generate interest in their products last week, hoping that a head start on the buzz will translate into stronger sales. Makers of consumer electronics are refreshing their products for the holiday shopping season.
Amazon announced four new Kindle Fire models and a new line of stand-alone e-readers, while Nokia and Motorola unveiled five new smartphones between them.
Nokia and Microsoft, in particular, are trying to generate interest in a new Windows operating system out next month. The two phones announced by Nokia are among the first to run Windows Phone 8.