I just happened to be at Animal Kingdom yesterday, had no idea there was a Cast Member preview scheduled, and had no tickets. But they let us in with one Disneyland Cast ID who could bring in unlimited guests to ride. Just happened to be in the right place at the right time.
Great ride and pretty smooth, but those seats in the train are uncomfortable. Wait time was posted as 50 mins. Free sunshades for Florida Cast only, not for us... back in California now.