According to this article, the following statement (Stolen directly from the article in question) is true.
“Nintendo has developed a programming system that will allow small independent developers to make games for Wii download service.
“We cannot confirm at this time in what format the new content will be delivered, but in the future there will be original games available for download through the Wii Shop.”
Is there perhaps an XNA competitor on the horizon from Nintendo? One can only hope so.
(Source: computerandvideogames.com)