From Matthew Cerrone at Metsblog.com:

The Mets have acquired LHP Johan Santana from the Twins in exchange for four prospects.

…from what i can gather, names of players have not been made public until a contract extension can be worked out…the Mets have 72 hours to work out an extension with santana and his agents, which started earlier this afternoon…
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Here is what the USA Today article says:

The New York Mets have agreed to a trade for two-time Cy Young Award winner Johan Santana, giving up four prospects to acquire the left-handed ace of the Minnesota Twins, according to two high-ranking Twins officials with knowledge of the talks and a person close to Santana.

The deal is pending the Mets and Santana reaching agreement on a six- or seven-year contract extension and that Santana passes a physical; they have been granted a 48 to-72-hour window to do so. Santana has a no-trade clause that he will waive if agreement is reached on a contract extension.

The Mets paid a high price in prospects to land Santana, agreeing to send the Twins outfielder Carlos Gomez and pitchers Phil Humber, Deolis Guerra and Kevin Mulvey.

So the Mets gave up four prospects and one of them was NOT highly touted outfield prospect Fernando Martinez. I think if you’re the Mets, you had to make this deal and should be pleased with the results. Now comes the hard part - negotiating a deal over the next 72 hours that could be in upwards of $140 million over the next seven years.

If you are Omar Minaya, you have to be smiling. The Yankees and the Red Sox really lost interest over the last month or so.

The Yankees did the right thing as well and now won’t have to face Santana in the division. Never got the sense that Boston really ever wanted to make this deal in the first place.

I’m just happy I won’t have to write to many more “Yankees still in the hunt for Santana” posts.