"We are expecting a refresh to the iPad Air and the iPad mini. We think the devices could be thinner with a new processor," Kulbinder Garcha, a Credit Suisse analyst, said on "Squawk on the Street" Tuesday. He added that the new devices likely will incorporate Touch ID, the fingerprint scanner, and probably incorporate mobile payment system Apple Pay.
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Any improvements to the iPads will be incremental, though, said Frank Gillett, an analyst at Forrester. And the company may even hold off until next year to introduce Apple Pay on the tablets.
It's also widely speculated the company might show off a new iMac. The invitation to the event featured the vague phrase, "It's been a long time," and the desktop computer is due for some updates.
"If they are sticking with the headline of the invitation, then it might suggest they could be doing something on the screen side in a different way. Are they going to do a touch enabled iMac? Are they reinventing the desktop?" said Carolina Milanesi, chief of research and head of Kantar Worldpanel.
According to some reports and industry analysts, it's more likely the company will just be introducing retina display into the iMac and possibly new colors.
The company will also likely share the official launch date for Apple Pay, which is the company's new NFC-enabled mobile payment system, Gillett said.
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Apple introduced Apple Pay at its September event when it also revealed its new iPhone 6 models and the Apple Watch. No specific roll out date for the system was given, only that it would go live sometime before the end of October.
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According to a report from 9to5Mac the Apple already is training its employees on how to use Apple Pay and a report from MacRumors cites an internal Walgreens document as suggesting Oct. 18 as the date when the payments system will go live in stores.
The tech giant will also likely give a release date for OS X Yosemite and it may even be the same day as the event. And now that iOS8 is live, the company may also show off features such as Continuity and Handoff that are enabled by the new operating systems.