Update: The PlayStation Store will not be reinstated today.
"The latest information I have on PlayStation Store is that we are aiming to have it live by the end of May. Contrary to popular rumours, it will not be reopening tomorrow but we will let you know here as soon as the date is confirmed," wrote EU PlayStation blog boss James Gallagher.
Original story: PlayStation Network will receive Essential Network Maintenance today from 4pm BST through to midnight.
If you're signed in to PSN prior to that you'll be able to carry on gaming, according to an official post on the PlayStation forum.
Sign-in after 4pm, however, and you'll be taken to the site maintenance notification page.
Specific services unavailable during maintenance are PC Registration, Console Storefront, PS3 Account Management, PS3 Network Account Registration, PSP Network Account Registration and Qriocity Account Management.
The forum post doesn't mention PlayStation Store coming back after the maintenance. Today's the day, remember, that Sony intends to have the PlayStation Store working again.