A while back I had a screen cap of what venom looked like from the Spiderman 3 trailer and I did my best to clean it up to make it clear. Well Sideshow Collectibles, which sells really quality movie-related toys and collectibles has for an articulated Venom figure from Spiderman 3.
If you don't mind seeing what Venom is going to look like in clear detail (consider yourself warned!), go ahead and click on the thumbnails below for a much larger view.
Looks like he will be pretty faithful to the comic book. Usually Sideshow Toys items are proportioned just as they appear in movies and are extremely accurate representations.