Always a tough call. When an official announcement is made, or when a supporting document is made public, there is frequently a flurry of activity around a new project that can generate a couple of pages of posts. If nothing happens, then the posting activity stops and the thread becomes in danger of dropping off the bottom of the page. That's sort of the situation now with the
MH35 and
FiveFive Queen threads.
Of course, threads can be recovered if they drop off the bottom of the page, and once shovels start hitting the dirt (for FiveFive Queen), or when more speculative activity occurs (for MH35), the post count will go up again, so it really is nothing more than a personal preference whether a new thread is started or not.
The Junction Urban Village will be the largest private sector development under construction in the city. It apparently will cost about $100M, will transform an entire city block, and will be an architecturally significant project. As such, a new thread is probably justifiable.
If anyone wants to take the initiative, I would suggest titling the thread
[Moncton] Junction Urban Village / Main & Vaughan Harvey / under construction