There's some news about the Housing Trust of NS developments on Gottingen Street (
http://www.housingtrust.ca/projects/). They have been asking the city to waive development fees and provide other tax relief:
http://www.halifax.ca/council/agendasc/documents/170307ca1451.pdf
So it seems this project is still active, but may take a while. I hope construction will start soon because those empty sites plus the 2300 Gottingen development account for most of the holes along the street.