In that time he’s been posting odd pictures (in that they’re mostly black; though more recently star fields) on his facebook and twitter accounts about every fortnight. Each of the pictures has a numerical code associated with it, which, if cleverly parsed, could be useful information. They most likely fit location coordinates, though other options of star charts would seem fitting and possible.
It could be an elaborate viral marketing campaign. It could be an enigmatic puzzle adventure. Knowing MZD mostly from his books, I have little doubt there is some method in his madness, but further assumptions are hard to build upon.
So, of course, I’ve been keeping track.
Most of the data, maps, and notes I’ve taken is on my older blogger. Other discussions over at reddit/codes, another blog, and the home MZD forums also exist. The maps of Danielewski’s Boxes and Danielewski’s Stars are the most updated; the Familiar Places map combines them, though is not auto-updated.
We’re starting to make some progress, but please let me know if you would like to collaborate further.