Kenta Maeda signed in our league. Lots of Cuban players signed in here before MLB teams signed them. Some are signed in here that are still not signed with mlb.
It was my understanding that anyone over 16 as of July 1st, 2013 (since the J2 money was combined for 2013 and 2014) that has not been signed yet is a regular free agent no matter what country they're from.