This has been hinted at in a few posts (such as here and here) but I thought deserved it's own thread. Judging by the images used as examples and TRV's history with the 2010 Streetcar proposal it appears they plan a new streetcar here.
FIXED TRANSIT LINE
A fixed line will connect Panther Island to downtown establishing smart access from home to the Central Business District thereby reducing the number of cars on the road creating less mobile emissions and better air quality. Inside the island a “circulator” line around the perimeter of Panther Island will connect each development node and serve residents and visitors to Panther Island.