noname... I guess you are right. Nintendo does have a little history of October announcements beyond just being desperate.
Thrillhouse... No way is it DQX. I think that game is looking at a late 2011 release at the very earliest. I wouldn't be surprised if it launched even after Wii's successor is out. SE likes to launch one DQ per generation on as big of an install base as possible. That way there is tons of anticipation, and as big of a potential audience as possible, and a late 2010 release on a 12 million install base won't yield that combination.
"[Our former customers] are unable to find software which they WANT to play."
"The way to solve this problem lies in how to communicate what kind of games [they CAN play]."
Satoru Iwata, Nintendo President. Only slightly paraphrased.