Introversion's Rezzed Session: Explanations, Demos
Introversion used their developer session at Rezzed to explain why they had canned Subversion, and how the technology and ideas from that had become Prison Architect, which was playable at the show. It's certainly worth a look, and you can watch the session - which includes some footage of Subversion - below. Relatedly, you can also read my take Prison Architect here and here.