Yeah, right.... belive that and you'll belive anything. Sony have not given any official press releases to indicate a certain release date, that website is making porkies. Sony havnt even demonstrated a single playable title to the media, not even shown off the final controller design, just lots of smoke and mirrors pre-rendered tech demos. Maybe they'll finally pull their finger out at the forcoming PS Festival.
Very few developers have even got dev kits, let alone the final ones with the final Cell spec and nVidia chip. Fair enough, it might roll out in Japan in its standard Playstation launch window around March, but i wouldn't expect to see it come out in the US until september (same time as Halo2) and as i said expect a usual Sony pathetic & limp understocked UK release just before christmas.
The whole 'Spring 2006' thing came from E3 this year, they never said where. Maybe Sony will prove me wrong.. doubt it
PS. Sony are having enough problems producing the Cell chips that they have advised developers to program allowing for only 7 of the 8 cores to be functional.