1. Throw a lingering potion
2. Push it with a piston
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This didn't happen in earlier snapshots. I don't think it should, you can't push gas or clouds with things! Also a pain from a map making perspective. Confirmed for 15w40b
Confirmed for 15w45a. Though it's clear AreaEffectCloud is an entity, it's also representative of a gas cloud, so being able to push it seems very odd and unintuitive. In addition, mapmakers have no entities that aren't pushed by pistons (even Marker armor stands are), making it very difficult to mark blocks near pistons; if ever we were to have such a useful thing, a gas cloud would be the best opportunity.
Looks quite intended since the Cloud is an entity.