The verdict from the Chapterhouse case has now been made public. BoLS has done an excellent job summarizing it here: http://www.belloflostsouls.net/2013/06/legalwatch-games-workshop-vs_14.html
The interesting points for me (I've been watching this case for a long time) seem to be:
(1) GW seems to be the same as any other company for after-production parts made by other companies, and can be advertized as such by other companies as fitting GW parts.
(2) The innovative (character) models sold are GW IP alone.
Hence other companies simply cannot make models of Horus Lupercal, Abaddon the Despoiler, etc. But they can make and sell shoulder pads that fit GW space marine models. CAVEAT: I'm not lawyer and I don't understand the full implications. Hence this is just MY interpretation that could be right or wrong and you should not base any decisions on MY opinion at all.
But: this is just a verdict. There will be appeals, etc., yet.