We don't have an official press release yet, but Amazon.com has listed the 4th season
of Rowan & Martin's Laugh-In
for preorder on their site. This 7-disc set (26 episodes) will be released on May 8th, 2018
, and sells for a suggested retail price of $39.95. Amazon hasn't discounted that yet, but remember all pre-orders will receive the lowest price between your order date and release.