DS games are down to a trickle mostly, so I wouldn't expect to see many come out between June and October. October 2 is most likely just a placeholder date, not the actual one.
nick, I don't have the link but in another thread I did a comparison for how long ever mainline Pokemon game has taken to get from Japan to North America, I think the shortest was 5 months (I believe that was Emerald), but it looks like this could beat that at barely over 3 months.