The Japanese WiiWare service just took delivery of Pokemon Scramble today. We'd suggest that our friends in Japan get playing, as it appears that more is on the way!
Some scans have surfaced showing logos for what appears to be WiiWare versions of Pokemon Mystery Dungeon. Apparently, the Mystery Dungeon offshoot of the series will see three WiiWare installments in the future: Advance! Fire Adventure Group, Go! Storm Adventure Group, and Aim For It! Light Adventure Group.
The source of the scans is a pamphlet handed out at McDonalds. While this may seem like a strange place to get Nintendo news, it should be noted that in Japan, Nintendo and McDonalds are teaming up for a variety of DS related services to kick off on June 19.
Since we haven't seen the source material for ourselves, we'd suggest taking this as a rumor for now. We'll let you know if we hear anything more solid.