This is how i imagined it. The red lines are the track that the gondolas ride on when in the station.
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The only purpose for this would be for the Riviera station. If cabins were heading in the opposite direction, they could spin it around in the station instead of waiting for an empty one to appear from the current flow.
As
@JoeCamel pointed out above, this obviously isn't happening.
The general idea was to speed things up and not allow for people to get pissy when it's busy and wonder why empty cabins were being sent out.
The empty cabin idea doesn't really work as I forgot about the hotels at Epcot and it will only ever be an issue in the morning. There's never going to be an empty stream of cabins when it's busy. In the morning, the Riviera station will be passed by with people from CBBR/Pop/Art heading to Epcot or the Epcot hotels heading to DHS. At night, the Riviera guests will board like everybody else.