AppleInsider has reported that Apple has started advising their direct and indirect sales channels for the iMac that they might have a shortage in the near future because a refresh of Apple’s popular all-in-one desktop may be coming soon.

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A person familiar with the matter says the Mac maker is informing some of its distributors not to expect any further stock of the entry level 21.5-inch, 3.06GHz iMac, implying that production of that model has ceased.

At the same the time those who have ties with the company’s stateside reseller channels are advised to sell their current stock of iMac and to keep their inventory lean for the next few weeks.

The new update may have dual-core Core i5 model, as well as quad-core Core i5 and Core i7 configurations. The new update could also get Intel’s Core i3 processor at the low-end which would have the new family of desktops utilize all three flavors of Intel’s mobile Core line of processors. The new update may also have USB 3.0 and faster FireWire connectivity.

Last time iMac was updated in October 2009, when it had a major design change to 21.5-inch and 27-inch LED displays and now it looks like its time for another update for the iMac.

[via macrumors]