Well the boost number came from here: http://www.automobilemag.com/auto_sh...che_911_turbo/
The Car and Driver article IS talking about a NA engine. So, I don't know what the CR of the new Turbo is. I was just doing a quick read after I saw this thread.
I've never seen a FI car with a 12:1 CR. Saab had that variable compression engine that might have gotten close.