It has been nothing less than a huge weekend for Magic rumors. Let us review: First, a mysterious Angel was discovered in a prerelease pack. Next, Worth Wollpert confirmed the card was real, and from, well... Conspiracy, the upcoming supplemental release. Third, a serial number of sorts was found on the back of this same card, which turned out to be a US phone number that led to a recording of an encrypted message:
When solved, the string of letters and numbers turned out to be the text of a Magic card - specifically, this one:
Cogwork Librarian 4
Artifact Creature - Construct (Uncommon?)
Draft Cogwork Librarian face up. As you draft a card you may draft an additional card from that booster pack. If you do, put Cogwork Librarian into that booster pack.
This means that Conspiracy is meant to be a Limited format. Draft-manipulation effects are, of course, unprecedented, but a second pick can be mindblowingly strong in the right pack. Cogwork Librarian looks like just the card to lose friends with - which, one supposes, is part of the fun of joining a Conspiracy.
Thanks to the collector number on Magister of Worth - 48/210 - and the text of Cogwork Librarian, we know the set size of Conspiracy and that it's meant to be drafted, and not much else. Further details will probably come in the near future, so stay tuned!