While I have been providing information about which Toronto draft picks signed when last summer, I have neglected to lay out another PTBNL scenario which is fairly common on baseball's transaction page. Often when two teams decide to have a PTBNL as part of a trade, the two teams agree on a list of possible candidates. After a period of time, the acquiring team picks one of the players to complete the deal.
This genre of PTBNL was seen last summer in the Hunter Pence to Philadelphia trade. My understanding is that the Astros had a list of players(number unknown) to consider as a fourth candidate after they received Singleton, Cosart and Zeid from the Philies. I assume that teams use the "To Be Named Later" time to further scout the options so that they can make the best decision possible. In the case of the Pence trade, the Astros decided on outfielder Domingo Santana, who is currently playing in Lancaster.
All the talk about PsTBNL reminds me of a story about the ultimate PTBNL.
In 1984, a shortstop from the Dominican Republic named Jose Gonzalez made it to the majors with St. Louis. The player eventually decided that Gonzalez, his paternal last name, was too common in baseball. For the sake of uniqueness, he began using his maternal surname and became Jose Uribe. Apparently, the switch was successful as he remained Jose Uribe through the final season of his major league career- 1993 with Houston. Uribe was often referred to by teammates and others as THE player to be named later.