I am from San Cristobal and my family is actually originally from Ocoa! We have property in the town as well as Rancho Arriba (one of the many 'campos' in Ocoa) right by the river. I visit Ocoa every time I go to DR - it is one of favorites places to visit when I can!
I take pictures of the road to Ocoa every time I go and so I have been able to document the many transformations that road has gone through as well as the streets that are no more. Amazing.
Regarding the highway, As you know, the 27 De Febrero highway ends in San Cristobal. Right now, thats where the 'old' road meets the highway. The project is to expand the existing road to a 6-lane highway and extend the highway to lead into Bani.
Although it seems like it will never end, this is exactly how we felt about any other major Public Works Endeavor in DR. People never thought we would end up with a highway in the first place, an elevated highway nonetheless, tunnels and now a metro. But they did it!
I am sure that they will connect Palenque and 27 as this project nears completion. If and once they do, the commute will be a highway away to get into the capital and other places. I heard they are working on a better road into Salinas beach as well.
Remember that Leonel is very much interested in promoting tourism in the island. So these projects are a possibility in the near future.