The first issue is due to be released August 20th 2014 and will be priced at $3.99
The official announcement is below;
"IDW returns to Konami's horror masterpiece with Silent Hill Downpour: Anne's Story. Written by Tom Waltz (Silent Hill: Sinner's Reward, Silent Hill: Past Life and the Silent Hill Downpour video game), with artwork by Tristan Jones(Ghostbusters, Hoax Hunters)"
Check out official announcement and IDW Publishing's Facebook page right HERE
And also check out artwork for the comic via Silent Hill Memories
Variant 'Boogeyman' cover illustrated by Justin Randall.