From their announcement:
The ShadowSea website has launched, with a Flash version with animation and music and a basic HTML version for mobile users and those with slow connections. Both versions of the site are linked to the online store for purchases of books, miniatures and other items.
The website will be updated with additional areas to explore as new game supplements are finished. The next one on the docket is Descent into Stygia, where warbands can explore dark catacombs hidden below the ruined cities found in the Underlands.