Well, this article in The Denver Post says 36 have been applied for since May.
That sounds pretty good, since they just got a handful of models out a few weeks ago, and I don't think there are many people who would order a house without actually touring one.
The i-house will create more interest when people's orders start arriving on their land, especially in places like California. This should generate another wave of articles. I will link to all that mention any information that is new.
I'm planning my visit to the i-house model in Albuquerque, probably next week.