I don't know if anyone here has heard anything about
this but it appears that GW legal is getting a little over ambitious about the trying to take over the Space Marine trademark in
books. Basically they sent a letter to Amazon to pull an
authors book because it was about Space marines (not the GW marines, but generic space marines as per Aliens, Heinlien etc).
GW seem to think they were the first people to use the term, rather than it being a generic name for armies in space (as seen right back as far as the 30's).