It appears Hisashi Iwakuma has pretty given up on the Oakland A's and has decided that he'll be returning to the Rakuten Eagles next season. At least that's according to a report that was filed by Sponichi (and Sanspo is carrying the same thing) at 12:04pm JST.
And according to an unnamed baseball source mentioned in the report, Iwakuma is planning on holding a press conference on the 8th to announce his decision.
Also included in the report is the following comment by A's GM Billy Beane:
We are in contact with Iwakuma's [agent]. The only thing I can say right now is to wait for the deadline.