PSN will be taken offline today (1st June) at 4.30pm for scheduled maintenance. The service will be restored tomorrow (2nd June) morning at 7am.
With a PlayStation Store? There's no mention of it.
During maintenance the PlayStation Store, Network Account Management and Network Account Registration will be inaccessible, advised Sony.
PSN sign-in will be disabled after 4.30pm this afternoon. Ensure you're around beforehand if you want to remain signed in.
Sony announced yesterday that the PlayStation Store will be restored by the end of this week.