Update: I believe Espinosa is either 23 or 24-years-old.
This news comes to us via Jorge Ebro, who also broke the Rays signing of Leslie Anderson. At this time, I only know a few things about Espinosa. He is a left-handed reliever, who throws in the low 90s with a decent breaking ball pitch. I'm not sure of his age, but he is definitely ticketed for some minor league action. The Cuban Ball Players blog has some more info on Espinosa, but not much. He joins Anderson and Stepan Havlicek as notable international signings by the Rays this offseason