For some wonderful reason, Nintendo's Japanese and U.S. websites have been running interviews with various Wii development teams over the past few months. The Japanese interviews have been translated (though not always well) and are quite fascinating, as are the interviews that appear on the U.S. site.
For links and a lengthy discussion of each interview, go to the NeoGAF forums. (These forums are a great site for overall news, too!)
One bit of information that really made my mouth water: One of the guys who has worked on the Wii Shop Channel commented that he would like to see an arcade channel, where people can download and play arcade versions of games like Donkey Kong.
I've been hoping Nintendo would implement such a feature since the Shop Channel was first announced, as the NES versions of many of the company's arcade games just don't compare to the arcade originals. Hopefully someone will make this happen sooner rather than later!