So ENworld's Morrus has the scoop here. They are basically variations on the same style as the 3.0 and 3.5 covers....nothing unusual I guess, although I was really hoping for a return to "cover with good art" form but ...whatcha gonna do.
I have no idea if I will ever play 3.5 D&D again, given how Pathfinder has magnanimoulsy swept through my gaming spheres like some sort of fandom-powered ramjet sail sucking up gamers like stellar gas....but I will definitely grab these books, and definitely use them if one day the opportunity arises.
I'm so used to Pathfinder with its enhanced level of character scaling now that honestly 3rd edition would feel almost quaint and traditional by comparison, I suspect.
You know what? I likese these covers, they're less busy than the 3.5 covers, and have a better thematic style to tie them together with that stylized dragon motif in the faux leather.