Call me mad, but i can even see the new cover for a 4e Ravenloft - or "Domains of Dread I" as i would call it - trying to describe all Domains in one go is silly and just leads to shallow fluff:
A ghostly hand, holding a string of pearls that float inside a dark, shadowy mist. Inside of the pearls you see tiny figures moving, trying to get out, achieve something... and failing.
Oh, and another thing thats good about the new arrangement: its much easier to stumble into one domain, solve something, stumble out again. Older Ravenloft always seemed to expect: "youre in, now jump on the Domain Train (TM) and visit all these strange lands before you - perhaps - can get back to Faerun/Wherever."