We're still considering these iPhone nano rumors to be way over on the far side of fetched, by they just keep on keeping on, so here's the latest (via MacRumors):
DigiTimes highlights a report from Taiwan's Economic Daily News stating that two chip manufacturers, Taiwan Semiconductor Manufacturing Company and United Microelectronics Corporation, are expected to receive chip orders for Apple's rumored iPhone nano. The report states that orders would likely come in March, leading to a June release of the iPhone nano at the earliest. [...] Meanwhile, American Technology Research analyst Brian Marshall believes that the iPhone nano will not initially be launched in the United States.
Marshall (via International Business Times) bases this claim on no word of AT&T testing an iPhone nano, and then leaps to the speculation that China would be a likely place to the launch the new device.