This is not like a road project where government is paying for cost overruns and weather delays. This is private entities that have an incentive to get it done quickly and start making money, so they will get it done as quickly as possible. Though government will still hinder them with permits, building code violations, and hiring mandates.
They just broke ground on the theater project. According to the story they will NOT have the reclining seats as the AMC does in Waldorf. They did say the seats would be "oversized". They were also non-commital on 3D capability. My gut tells me that after the first announcment of the theater being part of the new center, the theater group has gone off and done some market research and the project has had a "reality check". That may account for the what seemed like long delay in getting to the ground breaking.
I forget what their projected opening was, but construction will be going on through the winter - so weather may have an influnece on whether it's late spring or earlier fall.