Groudon, Kyogre and Rayquaza are NOT on the list. You're thinking of that crazy list that had X and Y versions of Entei, a list that has already been proven false since it didn't include Mega Gardevoir, among other Pokemon.
The list we're talking about is a smaller list of renewed trademarks from earlier this year. Every Mega Evolution revealed so far was on that list. What's left is the following:
Pinsir
Jynx
Scizor
Houndoom
Heracross
Medicham
Banette
Latios
Latias
Now, there may be more beyond that list. But those are what was listed in the trademark group.
The list we're talking about is a smaller list of renewed trademarks from earlier this year. Every Mega Evolution revealed so far was on that list. What's left is the following:
Pinsir
Jynx
Scizor
Houndoom
Heracross
Medicham
Banette
Latios
Latias
Now, there may be more beyond that list. But those are what was listed in the trademark group.