Here is what I found on the expansion of the Panama Canal.
National Geographic:
Panama Canal Expansion Spurs Environmental Debate
Panama Canal Expansion Spurs Environmental Debate
The best quote of the article (IMHO) was:
"We are more than capable of completing this project," Newman said. "If we don't move forward, we Panamanians will miss out on the revenue the new, bigger ships will bring into the country."
They also have a photo gallery of the expansion (about 5 pics) here:
National Geographic News Photo Gallery: Photo Gallery: Panama Canal Expands
I found another article on Popular Mechanics:
The Panama Canal's Ultimate Upgrade
Panama Canal Expansion - Third Locks Upgrade - Engineering Preview - Popular Mechanics
Current maximum capacity that can pass through, and future capacity.