UK Site (I believe) Den Of Geek has put up a synopsis of the story so far relating to Desinty here. There's a very brief mention of the ARG at the end, a link to the twitter feed but not the facebook page.

Cheers
Jay

Not a bad summary of the leaked details so far, but there were a few annoying misleading errors there >=/

Yeah it's very much an "overview" rather than it being an actual piece of speculative blogging.