Increasing speculation and rumors surrounding the next-generation Apple smartphone have contributed to disappointing second quarter iPhone sales figures. However, analysts have assured that the company will take no time to bounce back in the next quarter as it launches the most-anticipated smartphone of the year in September. 

According to Gene Munster, analyst at Piper Jaffray, the demand for iPhone 5 will boost sales so much so that the figures may range between 6 million to 10 million sales in a week, which is 26 to 28 million units for the September quarter.

"We believe that if the 21st is the actual ship date, Apple could sell six million to 10 million iPhone 5s in the final week of September barring supply issues," Munster predicts.

Currently, the Wall Street estimates Apple to sell 22 to 23 million iPhones during the September quarter, but Munster believes that if Apple finally releases the iPhone 5 as anticipated in September, the sales will be even higher.

After ruling the U.S. smartphone space for quite some time now, Samsung's Galaxy S3 toppled Apple to become the best-selling U.S. smartphone in August. IDC's Worldwide Quarterly Mobile Phone Tracker also reported in August that the Korean electronics giant currently has a clear win over Apple in the smartphone market.

According to IDC, the South Korean vendor enjoys the highest market share with 32.6 percent, almost double of Apple's 16.9 percent share.

Samsung has benefited from launching its flagship Galaxy S3 combined with the success of Galaxy Note, but the entire scenario may change once Apple releases the hotly-anticipated next-gen iPhone, believe experts.

With Apple sending out invites for a Sept. 12 event, iFans and experts will have to wait and watch if the iPhone 5 sales predictions bear fruition.