We kind of have this covered in the '2020 rumours and predictions thread:
But I'm all for the creation of new forum topics.
AT THE GATES - according to a reliable source
BATTLE BEAST - convenient gap in their tour dates
DIVIDED MULTITUDE - were invited to play 2019 but couldn't make it
EPICA - 70k-sized hole in their USA tour-dates, and "cozumel" and "miami" listed on tour shirts
VISCERAL DISGORGE - Were asked to play 2019 very late, and have a new album coming out