Sony showed the PMW-F3 at a LearningLab at Rule Boston Camera this past Wednesday, and they've now posted a video of the event. This talk goes through a lot of features, including S-Log and external recording options. It's 2 hours long, but does include some sample videos at the beginning and end.
Rule Boston Camera: Rule Website
Learning Lab: Sony’s PMW-F3 Super 35 Digital Camera on 1.19.11 from Rule Boston Camera on Vimeo.