I think its important that in both the first teaser and then in the ComicCon footage, the symbiote and Venom are featured promently. This is more emphasis than I thought there would be and indicates that the film will likely have more emphasis on the symbiote and Venom than I originally thought.
And even though Sandman looks well done and I generally like Church as an actor - and Harry going mad, imulating his father and becoming a Goblin thing of sorts makes for good storytelling, for me and expect many others, the sight of the black ooz hits another level. I sort of murmured in a hushed rather wary tone; "Its the symbiote" ... and then; "My god its VENOM!" It sent the hype and my anticipation right through the roof.
So even though Venom's actual screen time may be limited, the symbiote and its effect on Peter and then the evolution of Brock into Venom looks to play a major role in the plot of the film and psychologically has lit the match to what looks to be a powder keg of a SPIDER-MAN movie.