Already available to order on play.com
http://www.play.com/Games/Xbox360/4-...92&source=9316
Yea the inards - chips and mobo, HDD seems internal as well now and so does the psu.
Update: Here are some detailed specs.
• Touch sensitive on/off and eject buttons (like the PS3)
• "Much quieter"
• 250GB
internal hard drive, which is still swappable.
• A custom Kinect port (not the standard USB port)
• There are five USB ports now, with three in the back and two in the front
• AV cable included, an HDMI and optical audio
• Different power supply
• External Xbox 360 hard drives and memory units are NOT compatible with the new Xbox
• Other accessories are
• Internal components that are changed: two small fans changed into one large fan for quieter operation, 45nm integrated CPU and GPU