Bluesnews has posted a press release that confirms Ritual's SiN will indeed be delivered by Steam in episodes.

Dallas, TX - July 7, 2005 -- Ritual EntertainmentTM today announced the development of SiN EpisodesTM, featuring the highly anticipated return of Elexis Sinclaire, the world's most dangerous and seductive biochemist, and the only man who stands in her way, John R. Blade. The sworn enemies face off in Freeport City, a near-future mixture of San Francisco, Tokyo and New York, all set inside the unrestricted SiN universe.

The upcoming SiN Episodes chapter entitled Emergence is the first in a series of episodic adventures powered by the award-winning Source TM engine developed by Valve®. Delivered on SteamTM, the online content delivery system, Sin Episodes takes a bold new step into the future of gaming.