Official website and older news announcement.
To copy-paste the specs to you:
- 700MHz ARM11
- 128MB or 256MB of SDRAM
- OpenGL ES 2.0
- 1080p30 H.264 high-profile decode
- Composite and HDMI video output
- USB 2.0
- SD/MMC/SDIO memory card slot
- General-purpose I/O
- Optional integrated 2-port USB hub and 10/100 Ethernet controller
- Open software (Ubuntu, Iceweasel, KOffice, Python)
Now, this thing is gonna be running Ubuntu 9.04. The power consumption (peak!) is said to be 1 Watt. With a price of 25$, this would be cheaper than most HiTechnic, Mindsensors or Dexter sensors. As long as you could somehow get the device powered, you could easily connect it to the NXT via USB. You then had the full computing power of that system, including all the software that runs on a common Linux. Even better with the USB port, you could finally go ahead and connect real webcams, joysticks, AND WHAT NOT to your NXT . You'd only need a small USB hub as well.
Just one tiny cool idea: When connecting the Pi to the internet (via ethernet to wifi, or simply via wifi USB stick), you could even send NXC programs to the device via internet, have NBC on linux compile them, and flash them on the NXT. All from remote (yeah, I know, you could do that via Bluetooth right now).
This thing is gonna be so great!
And I think the foundation's motto is an excellent fit to LEGO / NXT:
Put the fun back into learning computing.