Not much here so far, except this link to the Key Detail for the map. Created by KRT at the Atari forums, each overhead map contains the placement of every item of each "official" map to date. Severance Key Map
This is the second largest onslaught of a map. This map does contain a Leviathan, however it spawns next to the center node. This means that your team must control the center node in order to gain access to the Levi. Almost every time I have played this map, the team that controlled the Levi has won the battle. Therefore, control of that center node can be extremely important. This map also contains the target painter on each side, and it can be used as a good defense against the Levi. It is an imperative that you worked as a team on this map. If your team does not work together it will almost assuredly mean failure..
Unfortunately, someone usually ends up camping the redeedemer spawn, and thus are useless for team-based offense or defense
What I find unusual is that this map is slightly smaller than Dria, however it is not in rotations where the Dria map is.