New Scientist has my take on the story
http://www.newscientist.com/article/mg20127005.100-were-all-dinosaurs-beasts-of-a-feather.html
I talked with Alan Brush who says the "protofeathers" were hollow
unbranched structures, just as he and Rick Prum had predicted the
ancestral form would be. I'm no expert, but it's looking plausible
that some kind of filamentary fuzz might have been primitive within
archosaurs after the crocodiles split off. Or perhaps before; it
could be that the fuzz was easy to lose.