@NAI: I think Tagforce is right. The safety car has always in the past picked up the leader and let lower placed cars ahead of him through, but now lapped cars that are between cars on the lead lap (like cars which the leader has lapped but nooone else has yet) will have to pass the safety car and once they are effectively back on the lead lap, they can return to the tail of the field.
I guess it's just to make restarts more interesting. Rather than have Leader/backmarker/backmarker/second-place/third/backmarker etc, now they will punish the leader even more when a safety car comes out, because no matter how many cars he has safely lapped, he will have the second place car right behind him at the green.