i would not be surprised if thats why they cancelled it. aside from this picture:
i was never too hot about him being a muun, with all the aliens in the starwars mythos to choose from: a muun?
why not a gungan while were at it. quite frankly i hope theres a better reason than we don't think he should be a muun, like maybe they'll make a pc game /multimedia thing.
but personally i was really excited about the prospect of getting a new luceno book, if anyone remembers an insider article with him about dark lord, he voiced his hopes of doing a Plagueis/qui-gon book where both would separately be searching for the way to beat death and ultimately come up with different methods. now, what if in a rough draft JL attempted to portray the shamans of the whill as yoda's species? I'm pretty sure Lucas would smack that outta the park. hence the cancelllation.