I have a wild theory on this delay:

1. Sony was supposed to show off their VR headset earlier this year, but postponed it until early 2014.
2. Sony used Driveclub to demo the headsets internally.
3. Driveclub is postponed until early 2014.
4. ???
5. Profit!

Driveclub would be a great match for VR (cockpit view paired with wheel and pedals. Solves the problem of uh.. "bodily disambiguation".), and Sony needs a "killer game" to sell their headsets.