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the picture is of a new lens for spiderman. smaller than the other one in the previous movie. notice the thicker black lining, could be reading too much into it but maybe we'll see spidey and the symbiote merge. he's going to need a power boost to take on both the electro and the rhino. remember from spider man the animated series as his fought with rhino he wore the black suit. maybe spider man wearing the black suit will cause someone close to him die. possibly gwen stacy.
maybe we'll see him free himself from the symbiote and during the credits there'll be a scene where the symbiote finds Eddie Brock setting up a third film where spidey takes on venom