The cover of Cibola Burn seems to have been redesigned ever so slightly, centering the title vertically and also putting it on one line. I found the new one on Kirk Benshoff's website, and it seems to have been uploaded as recently as October 2.
You can compare them here:
This new take on cover design for the Expanse – the author's name is much larger and the book's title has the same color it has on the book's spine – is also used on new paperback editions of the old books. Amazon claims these new editions are from June 2012, though, so I might just be slow to catch up with things.
Check out Amazon's paperback listings:
That's today's detective work. What do you think of the new designs? I know I'll have to buy the new editions, in addition to my hardcover and paperback versions…