Ritual's SiN 2 is official. Not only that, but the sequel is boasting strong links with Valve Software. It's being built on a tweaked version of Valve's Source engine and according to word in PC Gamer magazine will be released in a number of episodes over Steam, each episode said to be six hours in length and being flogged at around $20 a pop.
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http://www.computerandvideogames.com/r/?page=http://www.computerandvideogames.com/news/news_story.php(que)id=121433
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http://www.computerandvideogames.com/r/?page=http://www.computerandvideogames.com/news/news_story.php(que)id=121433