haha 1st who will get this device is Ninja... 

Regarding weight, as this is a prototype they're not committing to anything yet.

But we'll hear more hands-on impression tomorrow, since there will be a few VR demos from Sony:

- [b]EVE Valkyrie (CCP), a multiplayer dogfighting shooter that uses virtual reality to give the player the sense of being a real pilot in an EVE Online spaceship
[/B]
- Thief (SQUARE ENIX Co., LTD.), which allows players to explore the dark shadowy world of the stealth action title

- “The Castle” (SCE) that shows various VR　interactions utilizing PS Move

- “The Deep” (SCE), where players can observe the waters from inside a shark proof cage.

Yeah, just saw the trailer, looks awesome.