I don't know, there already is a event Pokemon right now (Latios or Latias via the Enigma Stone) and that is set to end the day the new commercial starts. Maybe they could give use the Mew that Japanese gamers got back in January? Or better yet, the Celebi that will be used to unlock something in Black and White (especially since the only other time they gave us non-Japanese gamers Celebi was the 2006 Pokemon 10th Anniversary Tour).