Thanks to Actar, we've got a bunch of nice, big photos of Leader class Jetfire from the upcoming new Studio Series assortment. Jetfire is designed to work with the newly remodeled Voyager class Optimus Prime allowing the two figures to combine as seen in Revenge of The Fallen, and reportedly the combination process follows a similar track as the movie, requiring Jetfire be ripped limb from limb to facilitate the merging.
One photo shows the Studio figure with the original ROTF Leader toy, both in vehicle modes demonstrating that a lot of scaling down has taken place over the last decade, but the new Jetfire still has some respectable volume about it.