Alongside the expected launch of the iPhone 5, Apple will launch an 8GB version of the iPhone 4, according to a new report. Citing persons with knowledge of the matter, Reuters reports that the flash memory for the handset is being manufactured by a Korean company, and refers to the handset as “the cheaper 8GB iPhone 4,” perhaps indicating that it will fill the spot in the iPhone lineup currently held by the 8GB iPhone 3GS. The report…