Capcom recently decided to actually make two games that they were going to pass on initially :
Lost Planet and
Dead Rising (One of the best zombie games ever made).
Both games have won awards and sold well. So Capcom knows for a fact that zombie oriented games do sell well and Dead Rising is still hot atm. If you pitch Roses of Blood to them, now would be a good time.
Make sure your pitch has all kinds of concept art and a full copy of the book with it
I could actually see Roses of Blood as a combination of Lost Planet and Dead Rising, which rocks.