Pokepark 2? The first one came out just over a year ago! (almost 2 years in Japan)
This is a bit of a let down really, with all the other expectations we had for what the game. Although I do see why they would want to add Generation V to the game, especially with its popularity amongst small children (and nobody else). Though I'm willing to keep my eyes open to find out what this game has that needs Junichi to come out and introduce it himself. Maybe it will be better than we expect.
Although I am curious about the Mewtwo event, if it is also to tie in with the anime then I am hoping that it's the Mewtwo. It would make some sense. Since after Mewtwo Returns, Mewtwo once more disappeared to some far-off place. Unova is pretty far away from Johto, so it could be that he's chilling in Nimbasa City somewhere.
If it's not the same Mewtwo, then I have a feeling that Team Plasma are involved. Since Plasma are known to meddle with genetics, as seen with the TP2 Lab and Genosect. It would be possible that Team Plasma made a Mewtwo of their very own. Though if the event starts in late September, then it means that we won't have to wait too long to find out.