Thanks to Biohaze.com for collecting the Comic-con stuff together:
All-new demo's being played on the PS3. I've only seen the Leon one so far but I saw some changes from the 360 demo released via Dragon's Dogma:
* No screen-tearing
* Enemies react a lot more to gun shots, especially the zombies
Leon's Comic-con demo (no audio, cam) http://www.ign.com/videos/2012/07/12/resident-evil-6-leon-campaign-gameplay-1-cam-comic-con-2012
Here is Jake's demo
http://www.ign.com/videos/2012/07/12/resident-evil-6-jake-campaign-gameplay-1-cam-comic-con-2012
http://www.ign.com/videos/2012/07/12/resident-evil-6-jake-campaign-gameplay-2-cam-comic-con-2012
Chris's demo
http://www.ign.com/videos/2012/07/12/resident-evil-6-chris-campaign-gameplay-1-cam-comic-con-2012
http://www.ign.com/videos/2012/07/12/resident-evil-6-chris-campaign-gameplay-2-cam-comic-con-2012
All-new demo's being played on the PS3. I've only seen the Leon one so far but I saw some changes from the 360 demo released via Dragon's Dogma:
* No screen-tearing
* Enemies react a lot more to gun shots, especially the zombies