Local sources are now confirming what the USA Today began reporting, that the New York Mets will have a maximum of a three-day window with which to negotiate a contract extension with Johan Santana. Additionally, sources concur on what players will be involved in the transaction; according to Bob Nightengale, coming to Minnesota would be outfielder Carlos Gomez, and pitchers Phil Humber, Deolis Guerra and Kevin Mulvey. If this these are indeed the players involved, they're the same players discussed here, based off Joe Christensen's article at the Star Tribune.
While it's possible that the Mets can't work out an extension, at this juncture that doesn't seem likely.
For New York reaction, jump over to AmazinAvenue, SBNation's blog for the Mets.