From one of the leakers comes images of the Studio Series 1986 Arcee, comparing it to the original version of the mould from 2014, and the Kingdom Arcee as well as the Cyberverse Deluxe Arcee.
This gives us a good look at the new parts, such as much thinner thighs, new panelling at the back of the vehicle mode to hide the legs, and the new waist joint.