Dark Horse has a five-page preview of the Revenge of the Sith comic adaption. They’re not consecutive pages and there’s no text yet, but there are a few things new to even the extremely spoiled.
Rebelscum has a scan of the ROTS adaption cover art. It’s by Dave Dorman, who I can’t recall seeing for a while. Extremely picky artist types will note the faces are slightly off, giving Anakin and Padme that Young Jedi Knights look.