The Softbank Hawks officially announced the addition of Hayato Terahara today. He was also assigned the number eleven -- Kazuyuki Hoashi will go from the number eleven to the number forty-seven.
No other information is known at this time.
Source: official announcement
UPDATE @ 9:38pm - Terahara likely signed a three-year deal worth up to an estimated 400 million yen. Source: Sports Hochi 12/4/2012