So Mark Rosewater has said that minotaurs are coming. Nyx is the name of the Greek goddess of the night. Greek mythology has minotaurs. The block code names of Friends, Romans, and Countrymen have no bearing on the set itself as I'm pretty sure "Peanut" "Butter" "Jelly" "Doughnut" had absolutely nothing to do with the Lorwyn-Shadowmoor block.
Also, the trademark (as all set names get trademarked, at least a short time before revealed if not even earlier) has the following portions:
- IC 028. US 022 023 038 050. G & S: Card games, trading card games, playing cards, and accessories for use therewith
- IC 041. US 100 101 107. G & S: Entertainment services, namely, providing online computer games and interactive multiplayer online computer games via a global network; providing online publications in the nature of e-books in the field of fantasy adventures
So the trademark is for trading card games and "multiplayer online computer games" which would cover Magic Online which gets the same sets that are released in real card form.
When a quick search doesn't pull up anything (MTG Salvation actually has a forum post now. I researched this for a week or so before it was posted. But I only post on Mondays. Convenient, no?), it has to be something WotC has yet to announce for MTG.
There is not much else this could be. My only doubts are that none of the Planechase planar cards have "Nyx" as a plane, but the name fits (Champions of Kamigawa, Shards of Alara, etc.)
EDIT: Obviously this is wrong. Theros was "Friends," Born of the Gods was "Romans," and Journey Into Nyx was "Countrymen."
