I've been watching the progress here daily. From what I know, the entrance to the new marina will basically be at the entrance to the existing Caleta ( like a Y .... go left for new marina, go straight for Caletta) . About the only thing that will definately be affected will be the shore access to Paradise Reef that is currently there and will be shut off soon due to the channel that will be opened up at the corner. They are digging the final link now.
( The new marina is full of water now). It will be interesting if there will be a new shore dive location with access for vehicles at paradise.. It is a good spot for open water training dives. Personally , I just don't see that much more traffic going through there and if there is, it will be at the entrance. The biggest problem will be when the channel opens up and water transfers.... maybe they have it figured out so as not to have a mess coming out into the reef.