The PS2, XBox, and Gamecube were refered to as Next Get upuntil the 360 was announced. AT which point the 360, and later the PS3 and Wii, were refered to as Next Gen and the PS2, XBox, and Gamecube became Last Gen before the Next Gen was even released.
It doesn't make sence, but the ecomomy is a pack of idiots anyway. It's something to do with always getting people to buy the next big thing, making them think they're living in the past before the next think is even released. It's the same thinking that gets us prices of 9.99 instead of 10. Everyone selling something is out for an edge.