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Clayton Morris said the event will focus on the three products, but new iPhone hardware will not be introduced. However, he said, iPhone OS 4.0 (which he referred to as "iPhone 4") will be a part of the proceedings.
"I spoke to a source at Apple this morning, before the invite hit my inbox, who said the event would likely focus on three projects: The tablet device, iPhone 4, and a new round of iLife 2010 software," Morris wrote. "While we won't see new iPhone hardware just yet, we will see the next-generation software."
Morris went on to offer a caveat that Apple sometimes changes its mind about what products to introduce at the last minute. He noted last September's iPod unveiling, when a new iPod touch was introduced without a camera due to rumored technical issues. Sources have told AppleInsider that the company still intends to add a camera to a future iPod touch.
The report also follows a rumor from earlier this month that Apple could ship a multi-touch version of iWork when the tablet debuts. It was not said whether iLife 2010 would be available for the tablet.
Earlier Monday, Apple sent out invitations to the event at the Yerba Buena Center for the Arts in San Francisco. The company used the tagline "Come see our latest creation" to invite select members of the press. The included graphic has the Apple logo surrounded by colorful paint splatters. The event is scheduled for 10 a.m. Pacific time.
Last month, select developers were allegedly asked to prepare full-screen demos of their iPhone applications for a public unveiling. Reports have said that some have been working with a new software development kit, iPhone OS 4.0, that includes a "simulator" that aims to make it easy for developers to adapt their software to different screen resolutions.
Late last month, Morris also corroborated early rumors that Apple would hold an event in late January. That report and the initial news from the Financial Times were off by one day in their claims, stating the event would be held Jan. 26.