It seems that usually people who follow tech or finance closely seem to know about it, if at all. And even then not always so much.
Yeah, of the 20 or so people I've mentioned it to, two had heard about it before. One of whom was a high-level guy at a major Wall St. firm in the 80s/90s, and the other guy is a tech-entrepreneur. Their level of knowledge about it was medium, I guess. They both understood the idea; that it's not just another internet currency, but neither had really thought about it or researched it much.