Who's excited for Spies in Disguise later this year? Blue Sky Studios Inc., Fox's former animation house that's responsible for the Ice Age and Rio franchises, really hopes that you are because their livelihoods may depend on that movie's performance more than normal. After Disney's big ol' buyout of all things Fox, including the animation studio subsidiary, Blue Sky isn't being shuttered just yet, but their new owner is already making power moves. As THR reports, Disney has installed Walt Disney Animation Studios president Andrew Millstein as the co-president of Blue Sky alongside …