Those empty lots with the lamposts on the streets in Del Sur have been that way since 2004. I know because we moved to 4s in march 2005 and started looking there in 2004.
Del Sur’s plan is to build all the way over to the Highschool, complete with commercial space and shopping. If you go into the current builders there, some have a site plan for the whole place (why this isnt up on the web is beyond me). The golf course was scrapped, as was the hotel to go with it. That was supposed to go in near the bridge at the low point on Camino del sur in the middle of the del sur and the east gate of Santaluz. That would have been a nice addition.
I think it will be a good 8-10 years before del sur is built out.