At least two media sources (Nikkan Sports and Sponichi) are reporting that Yu Darvish has decided to announce that he wants to be posted at some point (perhaps as early as today). As mentioned earlier, he is open to returning to Japan if he does not get the type of deal he feels he deserves.
Sponichi's report mentioned that close to 10 teams could be interested in submitting bid. An unnamed person with ties to the MLB is quoted as saying that it will probably take about US$20M a year to get Darvish, or six years at a total of about US$120M (both figures including posting fees).
A separate Nikkan Sports article that says the New York Yankees are keeping quiet about what they plan to do.
UPDATE @ 12:46pm - A different Sponichi article is reporting that nine teams, including the Texas Rangers, Toronto Blue Jays, and Washington Nationals, are interested in Darvish. The article also mentions that it could cost teams a total US$125M to secure Darvish (posting + contract).