The title pretty much says it all...
Ricardo Cabrisas was born in 1937 and is Afro-Cuban. He had been a Minister of Government, having previously been Minister of Foreign Trade. He worked closely with Fidel and enjoyed his support.
I don't see the move as being too important on the face of things. He went from Minister of Government to one of the VPs...not that big of a shift. I think this could be Raul trying to placate some Fidelistas.
However, this could be a simple substitution. Osmany Cienfuegos has not been an active VP in years, but he had never been replaced. Although it has not been confirmed, that is likely to be the person Cabrisas is replacing.