Maybe this time it could be themed Viking Death Squad, as well? To come out soon after VDS, so we get some cool new cards and assets?
I know they’re not the same game, but still, I can appreciate new assets for new adventures?
Maybe a new Think deck VDS-themed too? The possibilities are endless! 
Last year the community got together and made a set of MODERN cards and assets. You can check that out if you want?
More than likely Volume 5 will be community generated. There are some amazingly talented people in this community. They are in general extremely generous. Many people have already contributed. They have not been organized into a set or PDF as nice as Runehammer creates but it’s good stuff.
