What the... Venom and Bryce Howard as Gwen Stacy in Spider-Man 3?!

Ain't It Cool News was first with the scoop and I'm also just now reading at JoBlo.com that not only is Bryce Howard playing Gwen Stacy (?!?!?) in Spider-Man 3 but that Topher Grace is apparently definitely playing Venom. So the next Spidey flick will not only have more on the complicated relationship between Peter and Mary-Jane, but also Harry's vendetta possibly leading him to become Green Goblin II or Hobgoblin, the Sandman, some way of figuring out how to explain Venom without taking up an extra two hours screen time, and Gwen Stacy thrown into the mix?! This is either going to be the greatest superhero movie of all time... or it's gonna be WAY too much too fast and maybe ruin a great franchise. But I'll be there opening day to buy a ticket... if for no other reason than to see how the heck they run with the Gwen Stacy story.