All-new box with App Store and Siri support.
Apple Provides Sneak Peek Of Media Center (iTv) [Photos]
Providing various audio and video outputs, it is intended to be connected to a TV, communicating wirelessly with your Mac or PC and displaying a Front Row like interface for the content on your computer.
Built-in power supply (no power brick)
USB, Ethernet and 802.11 wireless connectivity
HDMI, optical audio, component video and RCA (phono) audio outputs
Works with the Apple Remote
The 'iTV' is to be available in Q1 2007, priced at $299.
Update: Photos of the prototype unit.