Apple's next mobile operating system, iOS 7, is going to make its debut at the Worldwide Developers Conference in June, despite the reported delays in the development of the iOS.

People were very skeptical about the arrival of iOS at the scheduled time after they heard reports about Apple running behind schedule and pulling developers from the OS X team to speed up iOS development.

According to a new report of AllThingsD, sources close to Apple's OS development plans told the publication, "Not as much of a fire drill, though. It will ship on time."

Apple's trouble with the development of iOS 7 was first reported by John Gruber of Daring Firball, saying that the development of iOS 7 was running behind schedule and Apple was trying to salvage the situation by borrowing developers from the team working on OS X 10.9's development.

Talking about the reasons behind the delay, AllThingsD's John Paczkowski says, "With SVP of Industrial Design Jony Ive now oveerseeing interface design, sources say Apple has adopted a unified approach to software and hardware design. And evidently the spartan, elegant aesthetic that Ive has developed around Apple's hardware is now being brought to bear on its software, as well."

Three days ago, a report from 9to5Mac suggested that because of Apple's senior vice president of industrial design, Jony Ive, the UI of the iOS 7 is going to lose all its gloss and will be a "really flat" one.

"The interface changes include an all-new icon set for Apple's native apps in addition to newly designed tool bars, tab bars, and other fundamental interface features across the system," the report stated.

Until recently, there was no official confirmation of iOS 7's arrival on the main stage at the WWDC, but the comment from Apple's marketing chief Apple marketing chief Phil Schiller leaned toward the release of iOS 7.

In a press release issued by the company on Wednesday, he suggested that Apple could also unveil to developers OS X 10.9, the next version of the Mac operating system:
"We can't wait to get new versions of iOS and OS X into (developers') hands at WWDC," Schiller was quoted as saying.