It seems that Sony may have snuck in a new feature to the PlayStation Store.
For those who may not have noticed, the PlayStation Network received an update today that was originally scheduled for last Tuesday. The reason for the delay was that there was a bug in the system. However, it appears another reason could have been for more time to add extra features to the store, as some rental options have appeared for certain titles.
Screens taken from our PlayStation 3.
Update
We came across the following on NeoGAF, and it appears that this is actually a part of the PS Now service.
That was taken by GAF user Chesskid1, via his web browser. We have also confirmed this to be true via our PS3.