According to this website will be released on spring but no region is confirmed.
My prediction the ps3 will be released as early as late april because i don't think sony will release their system on march because they want to finish the 1st Q of the year before they released their system. The 2nd Q of the year start in april so that could possibly be the released date of the ps3. I think what will sony do is that they will release the system in a 3 month period in every region. First I think they will release the ps3 in japan first in April because japan will get to play the ps3 first when sony do they're ps3 party on february in japan where they confirm playable ps3 games. I think the 2nd region will receive they're ps3 is the U.S. . I think US will get they're ps3 late may or early june. The reason for this speculation is that may is the month where E3 is held in the USA and its one of the biggest gaming event and Sony would probably have a new game announcement on the Ps3 and a playable demo of the launch games that would create a hype on the system. So late may and early june is the most possible released date in US. AS of Europe being the third region they would probably get their system in late June and early July or even possible of August.
This just my speculation so don't flame me on anything. The reason why I think 1 month difference on the three region is I think Sony learned a lot about the launch of the Xbox 360 where microsoft doesn't have enough systems. So I think 1 month difference would be good because it would give sony time to meet the supplies of the regions. The Xbox 360 only has two weeks difference on the released of the three regions that's the reason why microsoft hasn't been able to meet the demand of the system.
Nintendo is also planning to released revolution in a 3 month span in all of the 3 regions.
oh yeah I also found this interesting info might be old but interesting: