Here are some static shots of the Fish interacting with their environment.
Yes, the Post-Process Volume and Caustic Lights are included with Fish.
Keep in mind you can always Right Click a Skeletal Mesh (Right Click > Asset Actions > Export) and Export it as an FBX, which you can open in Max or Maya.
Also, as with all my assets, I will continue to develop Fish as long as you the Community continue to support it. So yes, more Fish will be added 