Per SI.com's Jon Heyman. The press release indicates that the Brewers obtained Rodriguez and an undisclosed sum of cash in exchange for two players to be named later, which must be determined within a six-month window.
This is the first real meaningful move of the trade season, and one that I would have liked to have seen the Rangers in on, as there was reason to believe that K-Rod's price was going to be lower than what his actual value merited ... there was the 10-team no-trade clause in play, his insistence that he would veto a deal to any of those 10 clubs if they didn't permit him to keep closing, and, of course, the looming $17.5 million albatross of a vesting option that presumably scared any team without a sturdy closing situation away. There were the high BABIP/walk issues in play with K-Rod this season, but he was still a good late-inning power arm, with a strong strikeout rate and good homer-suppressing tendencies.
It is, however, unclear whether the Rangers were on his no-trade list, in which case there would have been no possibility of a match, as slotting him as a setup man would have then required some form of additional compensation in order for him to green-light a deal, and may very well have
Jay Jaffe notes on Twitter that the Brewers don't actually have any decent prospects that can be listed as players to be named later. That pretty much conforms with my expectation that the Mets would be very eager to move him just for the purpose of averting that vesting option, and that they wouldn't be seeking -- or be able to extract -- very much for him.
For what it's worth, Buster Olney further speculates on Twitter that there's now a "very strong chance" that Carlos Beltran will be moved.