2015 is the estimated completion date from the contractor point of view, without anticipating the time it will take to get the route approvals from UPDA, Road opening (if needed) & eminent domain of lands(if needed).unless this project is under sea

Still we are talking about Qatari Diar & NDIA here, and those guys can push things faster than other government authorities when it comes to getting the right approvals to fast track the work.