London Aquatics Center - 2-months late and over budget!
The 2012 London Olympics budget was set at $4.3-Billion, $1.6-billion remains. The London Aquatics center was slated for April but now predictions are June. In my experience any pool construction or remodeling always goes longer than planned, I suspect it will miss June deadline as well.
From the Olympic Newsdesk:
Completion of the Zaha Hadid-designed aquatics venue has slipped from April to June due to complications with the design and fabrication of the steel for the wave-shaped roof.