Reading different advertisements and messages from Vstep for work placement I find out that the next Ship Simulation will be Ship Simulator 2010. Vstep planned a lot of new features including underwater worlds and lifeforms as (killer) whales, sharks, dolphins, penguins and birds.
To allow the creation of unlimited environments Vstep planned a scenery creation tool for the Ship Simulator game. This will concede the gamers to create their own harbours and waters (based on sea maps) and share their creations with the rest of the Ship Simulation community.
Source (in Dutch)
http://stage.vstepoffice.nl/stage/index.php?jobdetail=1&PHPSESSID=c9b158b25116b27461fbc839fa0ed43d