Attach a PS2? WTF are you guys talking about? Here are the specs:
UMD or Universal Media Device. This storage media is 60mm, about half the size of the traditional CD and has a capacity of 1.8GB. That's right GB. Expect massively complex, detailed gaming (for your handheld anyway). 2.4 inches.
ATRAC encoding support (Sony's proprietary sound format used in their minidiscs). This could mean it will be a multi-media device.
Graphics specs are also impressive: NURB technology for rendering with full 3D polygons.
The unit's widescreen LCD screen (480x272, that's the coveted 16:9 ratio we all love) will be backlit.
The unit's sound processing will feature full 3D sound, PCM, and will be "fully reconfigurable."
MIPS 32-bit processor.
Also, a secure ROM cartridge for anti-piracy efforts.
Super-one-chip solution for graphics, sound, etc.
Memory stick will be used for game saves. Also, for GPS functionality.
Rechargeable battery.
CPU: 90 nanometers with a clock speed TBD.
USB 2.0 connection for talking to your PC, cellphone, even your PS2.
Embedded RAM.
Supports additional video codecs (other than MPEG 4.)
And does this thing LOOK like it has to be attached to a PS2?

Two cupcakes were in an oven. One turned to the other and said "Damn, it sure is hot in here" and the other one said "HOLY SHIT! A TALKING CUPCAKE!"