Layton for Wii!? Not yet says Level 5.

http://kotaku.com/5377565/no-plans-for-layton-on-wii

Keep your fingers and thinking caps crossed, the professor may find it's way to Wii someday.

Thats too bad I think they could make a solid Wii game out of the series. Not sure how much longer the Wii will remain the prominent Nintendo console and continue to have games released for it. You are already hearing rumors of the Wii 2 so if nothing is in the works now considering development time of a game I'd be surprised if we ever see it on the Wii.