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According to Trademork, the next big thing might be fish. The video game developer filed for a trademark last week for the term "FishVille" in relation to online games.
There aren't any details as yet regarding what kind of title FishVille might be, but one can assume from the similarity to FarmVille that it will most likely be a resource-management type virtual sim as well. And since Zynga makes money from virtual item sales, we can expect a similar business model embedded in FishVille too.