There are a few new full illustrations, including (I think) several new half-page action scenes, plus three full-page illustrations that kick off each chapter, following the current format. Most notable of the new art is a full-page illo of the Acreon hauling the Drift Rock. The other full-page illos feature iconics fighting a sky fisher and one of the Sunrise Maiden zipping through the Corpse Fleet.
Side note about the Acreon:
** spoiler omitted **
You also get a separate PDF of interactive maps. As usual, these interactive maps don't include the starship maps originally featured on the inside back covers (though you do still get those maps within the hardback itself).
The Interactive Maps are a big bonus to those who use a VTT, or simply a big TV screen they can put virtual counters on ^_^