If I remember correctly this has been announced before and never materialized.  Maybe this time it will happen.  From what I understand the cost of the voyage on deck, which lasts about 18 hours, will be $ 99 each way. There will be cabins for one, two, three and four with prices starting at $140 will be offered, and the cost of the cruise to Bocas del Toro will be $277.

An announcement has been made that on October 24th a ferry will begin operating between Panama and Colombia, with a connection in the island of Bocas del Toro.  Two years after the last attempt to connect the cities of Colombia and Panama via a maritime route, Panama-based Ferry Xpress will be launching the project on October 24th. Augusto Terracina, director of Ferry Xpress, told Prensa.com that “… unlike two years ago when they tried to launch a similar product, the tour operator now has a contract with the owners of the ship Adriatic, which has the capacity to transport 320 people and 500 vehicles. ” “… The ship has 379 cabins and 300 chairs similar to those used by airlines in first class. It is scheduled to reach the Adriatic port of Colon on 23 October  and 24 out Friday night in Bocas del Toro, and then return to Columbus on Monday.”

Source: Prensa.com