http://www.oxm.co.uk/62889/xbox-one...s-new-details-on-smartglass-and-game-updates/
There will be 300 at launch, and you'll be able to create your own. "We are focused on building out a beautiful collection of 1080p gamerpics for our users on Xbox One," said Whitten. "You'll also be able to create full-body poses of your Avatar to use as a gamerpic. You'll see us do much more here in the future. At launch, we expect to have 300 gamerpics to choose from."