Source of this rumor is a representative of retailer Phones4U :
Speaking exclusively with T3.com, a customer sales representative at the St Albans branch of Phones4u has confirmed that the “iPhone 5 has been delayed until November following an issue with the handset’s software.”
Most recent rumors talked about expected release date of iPhone 5 pointed to last quarter of the current year, so we can say that this is reasonable expectation, but I don’t think that such level of information could come from such representative. Anyway this is good news.