"The DOF controls were simplified when ray-traced DOF was added. The near/far blur controls were not possible to include with the physically accurate DOF technique we're using for ray-traced DOF, so these controls were removed.
If you want to blur the background more than the subject/foreground, you can try setting the Sky object mode to Blurred Sky to pre-blur the background."
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Answered by Joseph Woodman:
"The DOF controls were simplified when ray-traced DOF was added. The near/far blur controls were not possible to include with the physically accurate DOF technique we're using for ray-traced DOF, so these controls were removed.
If you want to blur the background more than the subject/foreground, you can try setting the Sky object mode to Blurred Sky to pre-blur the background."