When is the next DLC coming and what's the name

[omenomaho]

Phoenix Point v. Cthulhu 1.6 - 30th of July

Not exactly :). DLC 2 is scheduled for August. I would say you have 3 weeks between Cthulhu and DLC2. But it is not like you will have to start a new campaign after the DLC because it will break your saves. You will “just” have to start a new campaign to activate the DLC.