WWDC 2010: Apple reveals iPhone 4: Thinner, High-Res Screen, Gyroscope

"Stop me if you've seen this", says Steve Jobs, showing a new iPhone that looks remarkably familiar to anyone who's visited Gizmodo this year.

Made of glass and steel, the device is 9.3mm thick (that's 24 per cent thinner than the iPhone 3GS), and features a front facing camera, a noise cancelling mic, a camera flash, and it supports micro SIM.

It's all very reminiscent of everything we've been seeing, writing, and reading about these past months. The only thing we didn't know was the story behind the mysterious seams. Not very Apple, we'll admit, to have gaudy seams around the device. But it's the antennae for Bluetooth, wi-fi, GPS, UMTS, and GSM.

The device will feature a much sharper image, thanks to a far larger DPI and a very high resolution screen: 960x640. It has 326-pixels per inch, which is a rather ridiculous DPI for a tiny 3.5-inch screen. Steve says if you had any more pixels per inch, it'll be entirely indiscernible to the human eye. It won't use OLED, but it has a 800:1 contrast ratio.

It will really help typography and menu elements pop on the screen (including the more complicated Japanese characters). The iPhone's home screen was shown off, entirely eradicating aliasing from the screen's icons. Steve says they're the same 57x57 pixel icons, just sharper thanks to the screen.

"Existing apps look better" says Jobs. Let's hope so, because some iPhone games can look a little crummy when souped up to the iPad's resolution (the new iPhone features 78 per cent of the pixels on the iPad). You can of course replace your artwork with high resolution stuff, if you've got the budget.

Underneath the hood, the whole thing will run on the A4 processor, the same thing that powers the iPad. It's also got a bigger battery (that's what the micro SIM is all about, giving more room for the battery), that'll give you seven hours of 3G talk time, ten hours browsing on wi-fi and 300 hours for standby.

It's also packed in with a three-axis gyroscope, and with the accelerometer you'll have six-axis, the same as the PS3's controller. This is good news for game developers, who'll be able to make motion control more precise than ever.

Camera-wise, it's got five megapixel snapper (compared to the three MP camera from the 3GS). It's got a backside illuminated sensor, too, to make your shots look better, and a LED flash. It'll record HD video with 720p at 30fps, which is lovely.

Apple has written a new version of iMovie specifically for iPhone, and you can send your creations straight to YouTube.

It'll have up to 32GB of storage. A little sobering compared to the 80GB sticker on the back of Gizmodo's prototype.