I guess that it could be possible since there are still a couple of days in August after this. But I get the feeling that it will probably be Yugi or someone else. I wouldn't be surprised if Konami continued to dangle the possibility of unlocking normal Marik like a carrot on a string to a hungry animal. Just like they drew it out with Yami Marik.
It's like I said, they are going to drag out releasing Marik for as long as they can just because they know that a lot of people want him. Why Konami would classify Arkana as a "long awaited" duelist, I will never know. (Are a lot of people out there just dying for Arkana?) Although it would be a good way to include more magician support, as long as it is not just limited to Dark Magician support.
I'm thinking Noah is coming soon, his voice sometimes can be heard at the start screen and the Electric Overload deck has multiple cards that he used against Kaiba and Yugi on the show.
Yeah it could be released but we dont know about Konami's plans. I would be pleased if they release Marik with "Ra', because on the previous event, Bakura was use Zorc that doesn't real in the yugioh world.