Well, a reasonable person would think:
1) Either this is true and companies aren't announcing anymore games for the Wii because there is a new console/upgrade coming up.
2) Developers think the Wii is not worth the effort and don't plan on supporting it anymore.
I really want to think it's Nº 1, but Nº 2 is also possible, since we haven't been getting announcements for a long time now and the HD games just keep on getting announced every day. I think 3rd party devs already gave up on the Wii, they will just have an ocasional game here and there, or a bunch of casual games like they had in the past. Seriously, I made a thread about this about 2 weeks ago ( http://www.vgchartz.com/forum/thread.php?id=98087 ), and 3rd party devs have almost nothing coming up for the Wii, the bulk of the games we are getting in the USA this year are games that took a long time to get localized and we are just now seeing them. Those same companies have about nothing else planned for the Wii.
The above gives this rumor strength, because considering there's almost nothing left coming up from 3rd parties, one could think all the games they were making for Nintendo's console were for this rumored one. Of course if the rumored one is a handheld one, then it will mean the Wii is not a console 3rd party devs see as viable to develop anymore.
Proud poster of the 10000th reply at the Official Smash Bros Update Thread.
tag - "I wouldn't trust gamespot, even if it was a live comparison."
Bets with Conegamer:
Pandora's Tower will have an opening week of less than 37k in Japan. (Won!)
Pandora's Tower will sell less than 100k lifetime in Japan.
Stakes: 1 week of avatar control for each one.