Known as iPhone 4 or iPhone HD, the device is rumoured to launch in the US in June.

According to Boy Genius Report US service provider AT-T has blocked off the month of June for employee holidays, the same way it did with the past two iPhone launches. According to sources, the only time AT -T has mandatory work periods is for new iPhone releases.

And with the next generation iPhone protoype found recently in a bar, it seems that Apple is only putting finishing touches on the device if it is already being beta tested by certain Apple employees.

Apple also recently released its iPhone OS 4 to developers, which is another sign that a new iPhone that will make full use of the new features is imminent.   As MacGuide previously reported, the next iPhone has a front facing camera and a higher resolution screen display that is likely HD.

Though all signs point to a June release for the US, there's been no word yet on when the device will hit international shelves.