Dates are for the mass market.  In-store dates for comic book shops are usually a week prior.

2016 -
JAN 19 - Starve Vol. 1
APR 13 - Black Road #1 (launch of monthly)
APR 27 - Aliens: Defiance #1 (launch of monthly)
MAY 10 - DMZ Book One
MAY 17 - Rebels: A Well-Regulated Militia
MAY 24 - The Massive Library Edition Vol. 1
MAY 31 - Eve: Valkyrie
JUN 28 - Northlanders 1: The Anglo-Saxon Saga
JUL 5 - Star Wars Legends: The Rebellion Vol. 1
AUG 2 - DMZ Book Two (re-issue)
AUG 17 - Briggs Land #1 (launch of monthly)
AUG 24 - Starve Vol. 2
SEP 27 - The Massive: Ninth Wave Library Edition
OCT 5 - Black Road Vol. 1
NOV 8 - Northlanders 2: The Icelandic Saga
NOV 22 - The Massive Library Edition Vol. 2

2017 - 
FEB 03 - Aliens Defiance Vol. 1
FEB 08 - John Carter: The End #1 (miniseries)
MAR 22 - Rebels "The Free And Independent States" #1 (launch of monthly)
MAR 28 - DMZ Book Three (re-issue)
APR 19 - Briggs Land Vol. 1 "State Of Grace"
APR 11 - Dark Horse Number Ones
MAY 23 - Star Wars Legends: The Rebellion Vol. 2
JUN 14 - Briggs Land "Lone Wolves" #1 (launch of monthly)
AUG 08 - Aliens Defiance Vol. 2
AUG 16 - Black Road Vol. 2
tbd - Northlanders 3: The European Saga