Yes, you should be able to request by emailing them with your order number. The last time Pete was discussing this, the majority of the covers would be the Raft version, with a smaller run for the composite version, but that may have changed, now that they have modified the originally unveiled composite version. I've got the Composite version requested for my #7 series, but I really like the clean Raft version of it.
Skeleton Crew also got a VERY brief mention in the current PS Newsletter:
"Meanwhile, FantasyCom looms large
It’s time to start whetting appetites for what PS is planning.
First off, on the Friday evening, we’ll be launching books from Ray Bradbury (SOMETHING WICKED THIS WAY COMES, which will include a lavishly illustrated version of the tale that started the novel, THE BLACK FERRIS), Ramsey Campbell (RAMSEY CAMPBELL, PROBABLY and THIRTEEN DAYS BY SUNSET BEACH), James Cooper (HUMAN PIECES), Harlan Ellison (ELLISON WONDERLAND), Joe Hill (20TH CENTURY GHOSTS), Stephen King (SKELETON CREW), plus maybe a surprise or two to boot. AND all the titles we got ready so frantically for NecronomiCon."
I don't know quite what that means in terms of seeing the book show up on our doorsteps, but hopefully this is good news!