Per T.R. Sullivan, the Rangers have acquired Clay Rapada, whose name sounds like a type of fishing lure, from the Detroit Tigers for either cash considerations or a player to be named later (which means, most likely, for nothing of substance).
Rapada turns 29 in March, and is a sidearming lefty who I assume will be in the mix for the Rangers' LOOGY spot this spring. He appears to be out of options, which I'd guess is why the Tigers were willing to basically give him away. The Tigers got him back in 2007 in exchange for former Ranger Craig Monroe.
The 40 man roster is now at 39.