Thanks to Shurtugal fan Landon, Shurtugal has now received a view of the cover-art for the Eragon tie-in book, which includes an actual picture of Saphira. The cover is online here. This is the first time a fully rendered picture of Saphira has been shown to the general public, and it looks like Fox/ILM/WETA has done a great job with it.
We have contacted Random House for a higher-resolution cover, and will post when we receive one.
We have heard nothing new about the trailer, so at this point we are still looking at a potential trailer on the movie Invincible, which releases next week (August 25).