Apple is officially calling the video-capable iPods released yesterday fifth-generation (Late-2006), while the original video-capable iPods are known simply as fifth-generation iPods. Both original and Late-2006 fifth-generation iPods currently should use iPod Software version 1.2. Version 1.2 software is required for both movie and game playing.
Meanwhile, the new iPod nanos are known as "second-generation" and should use iPod software version 1.0.
The new iPod Shuffle is also known as "second-generation" and used iPod software version 1.0.