Executives at Columbia Pictures think they have a winner with their new web-spinner. “ The Amazing Spider-Man ” doesn’t reach theaters until July 3, 2012, but the studio has already locked in a May 2, 2014, release date for a sequel. A Columbia Pictures spokesman said the scheduling move “speaks volumes” about the superhero relaunch with director Marc Webb and star Andrew Garfield , who are coming off of a winning appearance at Comic-Con International. There was considerable fan skepticism early on about the choice of Webb, who has directed only one feature film — the 2009 romantic comedy ” (500) Days of Summer ” – and arrived on this project in the long shadow of Sam Raimi, whose three “Spider-Man” films earned close to $3.5 billion in worldwide box office and keyed billions more in home video, toys, licensing and video games. Watch the teaser trailer after the Jump... “The Amazing Spider-Man,” now in post-production, takes the Marvel Comics icon back to his high school