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This has been posted yesterday in the JP news section
As you see the JP site has unlike the US and the EU site a schedule on what is going to happen.

Since its now 6:15 JST (morning) there may be a update soon.

Anyway they have posted yesterday, I'll try to translate it as much as I can.

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Schedule About The Server Restart:

The schedule may be different each region, so the dates can be different.

• Guide Update [DONE]

- Which is pretty much the schedule I suppose.

• Enable password change "PlayStation 3" System Software Update ver.3.61 [SOON]

- Like most of us know we have to change our password in this Phase we also have to download another FW update called 3.61 Notice: PSN will still be un-available in this phase.

• "PlayStation Network" will resume his services [SOON]

- As we already know there will still be a limited use of the PSN, the following services will be available.

(※ "PlayStation 3" only.

• "PlayStation Network" Sign in.
  
• Playing online games
  
• Account Management
  
• Watching video content
  
• Toro Station [Weekly] (Don't know what this is)
  
• Ad-hoc Party for "PlayStation Portable" (※
  
• "PlayStation Home" (※
  
• Trophy synchronizing (※
  
• Friends list (※
  
• Messages (※
  
• Audio\Video Chat (※
  
• Text Chat (※
  

The following will not be available:

• Playstation Store

• "PlayStation Network" resume of service [in May]
  

[/B]
- What they mean with this is easy, your PSN will be like it was before.

JP PSN is not up [PROOF]

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今すぐPCでサインインIDを変更する means Account management

I'll try to keep this topic updated as much as I can.

Probably only your password, if you do not know your password an email is needed. If you don't got your password you could also try to call Sony.