Bottom line, it appears tha the Coastal Highway between Rocky Point and El Golfo only has about 10 to 15 miles left to pave, and could actually be completed by this Fall, or at least by the end of the year.
Calculating the drive time from Southern California:
San Diego - Mexicali 2 hours
Mexicali - San Luis 1/2 hour
San Luis - El Golfo 1 1/2 hour
El Golfo - Puerto Penasco 1 1/4 hour
Add a little extra for tolls and military check points, and 5 1/2 hours is probably realistic. Based on that, it's not as much of a time savings, but the difference in the new road vs. Highway 2 is "priceless"!