Jedi Training Academy in Hollywood Studios and wait in line until it's time for your show. Instead, little Padawans can sign up and then go enjoy the park. Kids will be given a return time for later in the day. Space is still first-come, first served, but this means a lot less waiting and a lot more enjoying the park.
The change first took place during Jersey Week, one of the busier weeks this time of year, so it may just be temporary. We know that Disney has been doing this when it gets more crowded, but for now, proceed with the assumption that this is how it will be from now on with the possibility of reverting back to waiting in line.
UPDATE: For a full review of how the new process works, please read here.