Do you believe in what this article has to say? (check out the pictures)
http://www.jeuxvideo.com/news/2010/00041397-microsoft-planche-t-il-sur-une-360-slim.htm
translation:
"Although one must take this information with caution and retreat necessary, the two pictures below correspond to the motherboard of an Xbox 360, thinner and more compact than the current component of the console Microsoft. They come from the Chinese site bbs.a9vg.com. This would mean that the American manufacturer is currently working on a "Slim" for his machine, just like what Sony with its Playstation different. If there is nothing to confirm this thesis, the aggressive pricing of Microsoft practiced in recent years on his 360 no longer really the firm to continue in this direction, the call price of the machine is already very low (169 ?). The arrival of a Slim on the market is in itself a good way to boost sales of the 360 without breaking the umpteenth time its price. The last time a Chinese website was broadcasting pictures of the way the information had proved correct as it were the first shots of the PS3 Slim."
http://www.jeuxvideo.com/news/2010/00041397-microsoft-planche-t-il-sur-une-360-slim.htm
translation:
"Although one must take this information with caution and retreat necessary, the two pictures below correspond to the motherboard of an Xbox 360, thinner and more compact than the current component of the console Microsoft. They come from the Chinese site bbs.a9vg.com. This would mean that the American manufacturer is currently working on a "Slim" for his machine, just like what Sony with its Playstation different. If there is nothing to confirm this thesis, the aggressive pricing of Microsoft practiced in recent years on his 360 no longer really the firm to continue in this direction, the call price of the machine is already very low (169 ?). The arrival of a Slim on the market is in itself a good way to boost sales of the 360 without breaking the umpteenth time its price. The last time a Chinese website was broadcasting pictures of the way the information had proved correct as it were the first shots of the PS3 Slim."