http://www.youtube.com/watch?v=SWy7lRl-mzY
Make sure you are running the game in Direct3D 11 NOT mantle.
Create a Shortcut to BF4 using VorpX
In VorpX config Force Game to start on the Oculus
Make sure you have the latest SDK & Firmware for the Rift
If you are using a Catalyst Card, use 14.7Beta drivers