Apparently the department of transportation has been making changes to the regulations to allow companies like UBER to operate in PR. It is still in the works but likely coming to metro and maybe other areas.
In the past the taxi companies have been fighting it, but look like the department of transportation is in the process of getting it approved. It was a secret but somehow the press got a hold of it and it was made public, they are talking with different agencies to ensure that this type of service comes in smoothly with out severe clashes with other departments and public service. Taxi companies are not very happy. But this will allow more service as the service will be easy to join and maybe there will be more UBER like drivers than taxis in the island.
No word yet if they will institute the demand based pricing which in other cities allows them to charge up to 3 times the regular fair.