A GameStop employee suggests the video game accessory manufacturer provided the information during GameStop's Fall retail conference.
Rumors of a November 18th Wii U launch date swirled today, when a NeoGAF forum thread was posted revealing a potential leak by Performance Designed Products (PDP). Apparently, at GameStop's annual Fall conference, the accessory-maker revealed it was launching various Wii U accessories on Sunday, November 18th, which lines up with Nintendo's previous holiday hardware release timelines. Similarly, another source has informed Kotaku of a PDP representative suggesting their "peripherals would be available just ahead of the Wii U's November 18 release date."
The developers from Turn 10 speak about the added variables of tire physics in Forza Motorsport 4.