As per Jenifer Langosch, Anderson Hernandez will make $500K, Jose Morales will make $650K, and Logan Kensing will make $675K if they make the major league roster. With the recently passed Collective Bargaining Agreement, the major league minimum salary will be $480K in 2012 so none of these deals are significantly above minimum.
Morales also has a clause that he can ask for his release from the Pirates if he is not on the major league roster by March 31st. He has another option to ask for his release if not on by May 15th.