The Gardens By The Bay Flower Dome was open for a preview during the World Orchid Conference 2011 in Singapore. The garden, accessible via a skybridge from the Marina Bay Sands complex (see the last image below) is still under construction, scheduled to open in June 2012.
My wife and I were so impressed with the the grounds and the Flower Dome (the lower building on the left in the first image) that we visited two days in a row this weekend. The air inside the Flower Dome is wonderfully cool and dry, and the electricity is all generated on-site at the garden complex. The botanic displays are very nicely done--we were especially impressed with the different varieties of baobab trees, not to mention the orchids, of course.
Now we can't wait for June 2012 to come around.