Yeah Hill has been doing great with comics, The Cape is another that is a very dark take on what if a deadbeat guy gained the ability of a magical cape and what he would do with it against those he felt has wronged him in his life, and then there is The Wraith which is kind of a side story to N0S4A2 and goes into the history of the villain while giving a very interesting story of a group of adults that get pulled into Christmasland.
Locke & Key had a pilot filmed and shown for Fox years ago that was never picked up, I think the budget was claimed to have been too much for the network at that time. It had Nick Stahl, Sarah Bolger, and Jesse McCartney in it and Steven Spielberg was a producer, so there was a definite drive to make this work, especially after they showed it at Comic Con 2011. I'm wondering if they had waited a bit longer for the Hulu attempt if it would have gone through after Hulu has produced amazing series based on King's work with 11/22/63 and Castle Rock. I will say I'm very interested to see what Hill does with the new series he's working on for Locke & Key that is supposed to be a prequel and sequel to the original series and be almost 40 issues.
Another series with dark tones and a bit of humor that I've been reading the hell out of is Outer Darkness by John Layman who wrote the equally fantastic Chew. Outer Darkness is essentially Star Trek with ghosts and exorcists, and where the ships are powered by death gods who require a soul sacrifice in order to emit their power to the ship. It's a dark and action filled series with a decent blend of humor that is Layman is great with.