The Seibu Lions announced today that they signed Ryan Spilborghs and Dennis Sarfate to contracts.  They also announced that Randy Williams will be returning in 2013.  No other information is known at this time.

Source: official announcement, Sanspo 12/14/2012

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UPDATE @ 5:56pm - According to Sponichi, Spilborghs signed a one-year deal worth US$700,000.  Sarfate and Williams each signed deals worth US$800,000.  Source: Sponichi 12/14/2012

See also:

Seibu Lions agree to terms with Spilborghs, Sarfate, awaiting physicals