As I've said before, most DQ games don't see any announcements or video of their gameplay until nearly 2 years after they are announced. And it hasn't been even 2 years since it was announced. Not even a year. So we might need to wait a while, especially since Dragon Quest IX just came out and there's 2 more titles on the way (in Japan). Not to mention 4 titles to be released outside of Japan....
I'd expect 2012 release date at the earliest and some footage of the game to be shown at TGS this year very unlikely, but could happen.