We've still got no real conclusive evidence of that, but it's surely no coincidence that Sony has planned out scheduled maintenance for this evening.
The maintenance, which is set to run today from 16:00PM (UK-time) through until 00:00AM, will lock you out of various aspects of the PlayStation Network for a few hours. If you sign in before the maintenance kicks in and maintain connection you'll be able to continue playing online.
Sony's keeping tight-lipped about the reason for the maintenance, but it has to be to do with the Store return, right? Either way, we hope so. We've missed impulse purchases.
Update @ 16:02BST: A post on the European PlayStation Blog has talked down any possibility of the PlayStation Store returning overnight, stating that "it will not be reopening tomorrow but we will let you know here as soon as the date is confirmed". Boo!