This today from MLBTR, citing Jon Heyman's remarks about a conversation he had with Kinzer, Furcal's agent:
Furcal's agent, Paul Kinzer, said by phone that he hasn't fielded a correct guess from any media member on said mystery team. I gave it a shot on Tuesday night, throwing out the Reds -- who appear to be in the mix on some surprising names -- but he said that was incorrect.
So... the Reds now appear to be a dark horse to be the dark horse for Furcal.
At any rate, though, the comment that WJ is "in the mix on some surprising names" could be a Pandora's box for those of us who love to speculate.