Ubisoft's latest Sam Fisher installment is currnetrly only known Splinter Cell 4, but according to domain registration Ubisoft has obtained SplinterCellDoubleAgent.com in early October and to add more credibility to the possible subtitle, early November Ubisoft also registered the Splinter Cell Double Agent trade mark with the United States Patent and Trademark office. So far there has been very little info revealed about the game's story, features or its official name. Now that the cat is out of the bag, an official announcement will most likely follow shortly.