Check out the Whitewater Parks facebook page.
The page is a great place to peruse for the latest news on the construction, use, permitting, etc. of whitewater parks.
This is what I found:
The 2012 Olympic Venue is now finished and paddlers are training on it in full force!
The design is one of the first of its kind to use RapidBlocs which can be easily changed. This is awesome because with the rapidblocs it can change from an olympic slalom venue into a world class freestyle
venue in a matter of hours.
Link to more info on the blocs:
RapidBlocs | S2o Design - Reinventing Whitewater
Video showing the new pumped park: