I think they have a passion not found in other developers. They see the Wii and they see what we see; potential. As programmers, artists, directors and producers, they work together in the belief that there is better. So when one lonely programmer one night comes up with a great concept, they don't shun it away; they embrace it. For creativity is like the tide; you need to push off when it's at its highest.
We all need to relax and just wait to see how these games actually play, but I don't think announcing these games was a mistake, nor do I think it was prudish; simply self-fulling. They are proud of their work, and they want the world to know why. I want to know why.