According to a report filed by Sanspo, Yu Darvish will apparently be posted during the off-season. It seems Darvish has already spoken to the Nippon Ham Fighters and the club is on board with the decision (they have always stated they would be supportive of Darvish).
While clubs probably won't spend as much as they did for Daisuke Matsuzaka, some are estimating it could cost a club upwards of 3B yen to talk to Darvish (about half the amount Boston paid in order to talk to Matsuzaka).
Incidentally, the Sanspo article mentions that there are about 8 clubs interested in Darvish, including the Rangers, Yankees, Mets, and Braves.
It should be noted that none of this was actually confirmed directly by Darvish and that all of it is based on third party information. Darvish has gone on record a number of times to say that he won't say anything about the off-season until the 2010 season ends.