PSN Maintenance Beginning - Preparing For Full Relaunch

The Playstation Blog has recently announced that the PSN will be going down for maintenance for "several hours" to perform maintenance "crucial" for the full restoration of the PSN.  You'll be unable to sign in, but if you've already logged in there will be no issue staying online.  The post mentions that PSN restoration is "on track for this week in most regions."  Looks like they'll have the store back before E3 after all, but then, we've heard these promises before too.