As you might expect when a big phone manufacturer is about to launch a serious competitor to the iPhone, the iPhone 5 rumours start to appear again allowing Apple to stay in the back of our minds.

The latest is from iLounge, which has been right in the past about iPhone rumours and is being very specific about what it has learnt.

According to the site, which has even gone to the trouble of creating artist renders of their information, the new leak matches and expands on previous details that it has seen in the past.

So what are the specs claimed to be?

"The new iPhone will indeed be longer and thinner than the iPhone 4 and 4S. Approximate measurements are 125mm by 58.5mm by 7.4mm—a 10mm jump in height, nearly 2mm reduction in thickness, and virtually identical width.

"According to our source, Apple will make one major change to the rear casing, adding a metal panel to the central back of the new iPhone. This panel will be flat, not curved, and metal, not ceramic. Our artist’s rendition provides a rough idea of what this change will look like; it echoes the current-generation iMac design, to be sure."

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That change in height will mean a lengthening of the current 3.5-inch screen to roughly 4-inches on the diagonal.

If true that change in aspect ratio would mean that every developer would have to update their app to cope with the new screen resolution and dimensions - something that here at Pocket-lint we think Apple might not be ready to force on people.

As iLounge notes, Apple has done that before with the iPhone, but not since the first iteration before apps where so mainstream and such a lifeblood to the company's profits and the success of the phone.

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Additionally Apple will also introduce its new Dock Connector on the new iPhone,  iLounge claims.

"The new port will be a little larger than the bottom speaker or microphone hole on the iPhone 4/4S. It’s believed to have fewer pins than the prior 30-pin Dock Connector, perhaps only 16, and the shape of the hole is apparently closer to a pill shape than the prior rounded rectangle."

iLounge goes on to say that the new port, which has itself been rumoured before, will be used on all upcoming devices, including an update to the iPod touch that’s expected this year.

What do you think? Let us know in the comments below.