American Technology Research analyst Shaw Wu believes we won’t see the next generation iPod nano until sometime this Fall, and that the new model may sport a new magnesium-based enclosure. Wu says the new nano is facing transition issues due to a move to an SOC (system-on-a-chip) architecture. “In terms of timing, we continue to believe calendar Q4 is most likely, specifically October and at the earliest, late Q3, meaning the 2H of September,” he says. Corroborating a similar report earlier today, Wu says the new nanos may sport a new magnesium-based casing. “We believe this new casing will improve scratch-resistance, durability, and help lower Apple’s support and warranty costs,” he says.