By Marcus Leach

Tim Cook, Apple's new full-time chief executive, is expected to launch the latest iPhone at the technology giants 'Let's talk iPhone' event today (Tuesday).

Rather than unveiling an iPhone 5, as many had expected, the California-based company will launch the iPhone 4S.

As to how different the latest model will be from the current iPhone 4 is yet to be seen, but inside reports suggest there will be major changes.

The launch will be hosted by Tim Cook, now Apple's full time boss following Steve Jobs' retirement in August, his first event in charge.

There is divided opinion as to how different the two versions will be, and only at the event will one of the best kept technology secrets be revealed.

"We're expecting a flagship, high tier product to cement the iPhone's position as the must-have device," Ben Wood, director of research at analysts CCS Insight, said to the BBC.

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