Not faster, COOLER with the new CPU. All they did was shrink the size, and reduce the amount of power it draws, so it dissipates less heat. They didn't do anything to the clock speed, because the whole point of game consoles is to have a fixed hardware specification that you can rely on. Not this constant moving target like with PC gaming. Microsoft seems to get this idea less than the other console makers, as shown by their adding HDMI, which is just a giant slap in the face to their early adopters who paid the highest premium for the new console, but even they know better than to go messing with the core specs like CPU and GPU clock speed, amount of RAM, etc. When Sony doubled the RAM in the Slim PSP, it was used for UMD caching, not for games.
Ive owned a xbox 360 3 weeks before it launched (i was a designer so i was able to get one before launch but didnt really get a chance to get to know the insides) and a current core xbox 360 with the new cpu. But i noticed in comparing the new 360 and the old 360 that the older one seemed to run faster the the newer ones i use the same 20gb hard drive between the two and the updates are the same. and theoretically with the new cpu the new ones should run faster.. am i just seeing things??