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Apple shares fell $3.34, or 2 percent, to $166.19 on Tuesday.
Pacific Crest Securities analyst Andrew Hargreaves said the stock fall was likely due to bearish broad sentiment, rather than any disappointment related to the invitation. However, he expects any changes to the iPod to be incremental.
"I’m not expecting anything revolutionary," he said.
Apple’s iPod line needs to be refreshed and the price of its iPod Touch models need to be cut because they have a higher starting price than its iPhone, which includes a mobile phone and other features not included in the device, said American Technology Research analyst Shaw Wu.
The Internet-ready iPod touch starts at $299 (168 pounds) in the United States, compared with $199 for the iPhone.
"Pricing needs to be adjusted downward toward market conditions. We are in a tougher economy. That’s what makes most sense," Wu said.
Analysts said they still expect Cupertino, California-based Apple to refresh its MacBook notebook PCs soon.
Both Wolf and Hargreaves expect new MacBooks to be announced in the coming weeks, if not on Tuesday.
In July, Apple Chief Executive Steve Jobs said in a statement the company was working on several new products to launch in the coming months, but executives declined to give details.
(Additional reporting by Ritsuko Ando, Editing by Derek Caney and Braden Reddall)