A bit more info about the plot has been revealed;
Exclusive: Some Spooky Spoilerish Story Details on The Evil Dead Remake | Moviehole
Why these effing writers keep focusing on "comedy" all the time is beyond me. It's as if their memory can only cope with the last film that they saw, as in Army of Darkness.
There was only one obvious bit of black comedy in Raimi's original, in my view, and that was the scene where Scotty was dying on the sofa and Ash was smacking him about.