It sounds strange, and I haven't seen it reported, but the 3 brothers are leaving the National Zoo and going to the Aquarium in Denver.
They are leaving on the 27th for Denver, on Animal Air or Air Animal (http://www.airanimal.com/) IDK for sure, that might be their site.
I spoke with one of the keepers today, and they finally had some details. The move is going to be late at night, and to BWI and then Denver.
I'm sure I won't be the only one to miss these tigers. The three boys are named Marah, Besar and Jalan.
Read more on the fonz.org web site:
http://nationalzoo.si.edu/Animals/GreatCats/TigerCubDiary/