The experts at iFixit torn down the new Apple TV. Here some interesting info they managed to find out inside the new Apple’s set-top box:

• 8 GB of onboard NAND flash storage, an important piece of data that Apple has chosen not to speak, as the device's focus is on streaming rather than storing content.
• 256 MB of RAM, the same as the iPad and iPod touch but less than the iPhone 4's 512 MB.
• A4 system-on-chip package and Broadcom Wi-Fi chip, and other Apple TV's core internals are the same ones as the iPad.
• Empty space next to the 8 GB NAND flash chip, possibly for accommodation of a second one.
• Power supply comes in at 5.95 watts (less than night lamp).