Apple has confirmed the launch of the new iPhone 4 at its WWDC conference in San Francisco.

The new model, which is the same as the leaked prototypes seen in Vietnam and a bar near Apple's HQ in Cupertino, is made from stainless steel, features a glass touchscreen display and will be just 9.3mm thick, 24 per cent thinner than the iPhone 3GS.

"It's one of the most beautiful designs you've ever seen," said Jobs, to huge applause of the Apple faithful at the conference keynote, before going on to say that it is "the World's thinnest smartphone ever."

The new phone will be powered by the company's A4 chip, feature two cameras - one front facing camera and one on the rear (with the rear also getting an LED flash to allow users to take pictures in dark situations - like a bar?). Unlike the current 3GS model, it will use a micro SIM like the iPad and feature noise cancelling technology thanks to the inclusion of two mics.

In an attempt to improve network reception, the antenna will be inter-woven into the handset's back (much like, it seems, the HTC Legend) following complaints from Apple 3G, and 3GS users.

As you might expect it will come with Bluetooth, Wi-Fi (upgraded to 802.11n), GPS, and UTMS (3G) connectivity.

In an attempt to improve the screen technology without opting for AMOLED, Apple says that it has created a new technology called Retina Display.

The new display will promise text as good as fine print in a book - around 326dpi - confusing the eye into believing the quality of the screen is better than it actually is.

The new screen technology will, says Jobs, work for not only text, but also video and images. And it does, as expected, shoot 720p video at 30fps. There's also in-built video editing. Disappointingly, though, the max storage will be 32GB (not 64GB as Rik predicted here).

As before, users will get a 3.5-inch display at 960 x 640 (4x more than the 3GS) at 326 pixels per inch. Additionally you'll get a 800:1 contrast ratio (4x more than the 3GS). 

Battery life will come in at 7 hours on talk time thanks to a slightly bigger battery and a move to the new A4 chip, claims Jobs, with Wi-Fi browsing and and video stated to be 10 hours. Standby is 300 hours.

This time around the iPhone 4 will have gyroscope which, when combined with the accelerometer, will allow for 6 axis motion sensing. Controlling 3-dimensional objects is extremely smooth. There are also proximity and ambient light sensors. Jobs "can't wait to see what developers do with it".

Uncofirmed reports are saying that the iPhone 4 is launching in the US for $199 for the 16GB and $299 for 32GB on a two year contract on AT&T in the US. 

The new phone will be available in the US, UK, France, US, Germany, and Japan on June 24, with other other countries coming in July.