The fan created Nautican Warhammer Army book has been released as a PDF download.
From their announcement:
The deep had become uninhabitable, the Nauticans had no choice but to find safe dwellings in shallower coastal waters, their survival depended on it. It was inevitable that the Nauticans would come into contact with the surface dwellers.
A new fully playable army list now in PDF format and ready to use. This has been released to encourage play testing and feedback. Please post comments and suggestions in the Battle Reporter forum (see forum logo at top of Nautican Army list page)