Just because you change certain things around doesn't mean that it's still not damn retread of a story most freaking people know by heart. This an origin story. Sure, they are doing another version of it, but we've already seen an origin of peter parker to spider man. They can still do all the peter's parents, mechanical webshooters, etc with quick flashbacks. We really do not have to see uncle ben get shot again, peter being bitten by a spider, his discovery of his new powers, or his training. Those scenes alone will take up more time that it should. Hell, half the whole trailer was him discovering his powers.