Well, stuff that's been revealed is still free game, but anything plucked newly from Earthdawn's not since, you know, different company and all that.
That said, there're probably a couple of people in Aztlan that are interested in bringing Horrors over, but the main power block that Mr Darke had is long gone and with him went the majority of teh knowledge base. The fanbase rejected, and rejected MIGHTILY, the entire concept way back when (When Threats introduced the concept, there was a mail-in response form that asked for ups and downs on the assorted plots, and who buddy, did they bury Horrors), and sicne then there's just really been no push for it. I kinda dug it, but I'm in the minority, and there're way bigger fish to fry in writing terms, so, I've never bothered to put together any sort of Horrors Return proposal.
AFAIK, it'd be possible, if a convincing case could be made to the upstairs offices, but it'd have to be good and no one's really driving for it.
Really, Shadowrun has enough magical badguys right now. I'm more interested in getting some tech stuff in there and much more interested in the mundane, from gangers to megacorps. Everyone can interact with that kind of foe, but astral foes (or Matrix foes) inherantly lock out a good chunk of teh playerbase. More fun for everyone, I say.
