On the Nintendo Australia site, a October 18 news article has an interesting little tidbit at the end.
"Other upcoming games for the Nintendo DS include Clubhouse Games™, Mario™ Hoops 3-on-3 both on October 26th, Yoshi's Island DS™ on November 23, Children of Mana™ on November 30 and Pokémon® Ranger on December 7th. "
And there is a Pokemon Ranger page up on their games library, with very little info (for now?).
And, just because there's been enough Pokemon Ranger in the above, the news story has a cute Dalmation next to a DS Lite in a photo.
And yes, December 7 is the Australian launch day for the Wii.