We’ve seen the PSN go back up, now the PSN Store is coming very soon. Sometime this week actually. All PSN Store functionality like in game items, product codes, PSN cards/tickets will return. Music Unlimited Powered by Qriocity returns on PS3/PSP/PCs are back too. All of Media Go fuctionality are back too.
However, Japan, Hong Kong and South Korea’s stores will return sometime sooner, Sony says they will provide updates as and when they become available.