Joe Manganiello Spills 'True Blood' Secrets

True Blood star Joe Manganiello talked about the "big expansion of my character" in store for the upcoming season of the vampy HBO hit at Duracell's "Rely on Copper to Go for the Gold" launch event Wednesday night in NYC.

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"We're going to go further than my character went in the books, whatever that means, action-wise, romantically -- so there's a lot of fun stuff," he revealed, adding with a fist pump, "Go Team USA!"

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Other stars who helped to power the "Rely on Copper to Go for the Gold" kick-off event included Gossip Girl star Chace Crawford and Megan Hilty of Smash.

Inspired by the hard work and training of American athletes as they prepare for the London 2012 Olympic Games, Duracell has developed the "Rely on Copper to Go for the Gold" program to give consumers a portal to provide encouragement for the athletes through videos, pictures and texts as they train and compete for the games. The program is headlined by six-time NBA All-Star and 2008 Olympic Gold Medalist Dwight Howard, and features Team USA hopefuls Hunter Kemper (triathlon), siblings Mark and Diana Lopez (taekwondo), and former Olympic Gold Medalist Summer Sanders.