I will give them until October 1st to show new megas. Typically, they go crazy on showing off new features 4-6 weeks before release. If there are new megas, I expect 10-15 depending if there are Unova Megas and/or Johto Starters. Waiting until October to show off half of 10-15 makes sense because that is less. But if there are none on October 1st, I give up.