The link shows start of actual ground work at C15.
http://www.dailytimes.com.pk/islamabad/02-Apr-2016/cda-to-ensure-quality-assurance-in-new-sector-c15
Moreover NHA has tendered tarnol flyover alongwith a six lane expansion project from M2 intercahnge till taxilla underpass.It is expected work is going to start soon.
It looks like in future years Islamabd Zone 2 Infrastructure will be much better and will have good prospects.