Ok, I'm pretty sure this means that the trains will have no chain dog; the chain will have a device that grabs the car and hauls it up the lift. So, in other words, the train isn't going to attach to the chain, the chain will attach to the train. Hopefully that's not too confusing.
Someone please correct me if I'm wrong, but I'm pretty sure that is what that statement means.
It will most likely be similar to Intamin's lift mechanism used on Fahrenheit as well as the ZacSpin coasters. Uses redundant pusher mechanisms to push train to top of lift.