Nintendo (NTDOY) will kick off the video game console upgrade cycle on Sunday with its Wii U device, but the next-generation console could be in short supply this holiday season. Nintendo's Wii U is the first new gaming console in six years. Its predecessor, the Wii, launched in November 2006, the same month as Sony's (SNE) PlayStation 3. Microsoft's (MSFT) Xbox 360 debuted a year earlier, in November 2005. Sony and Microsoft are widely expected