Its at the same place it has ever been at - I hadn't heard about it moving in the near future though. Its a fun place to go, especially on days when its not crowded. I have friends who only go on the days when its free, and i think that's insane, it gets so crowded then. The Aviary is not the place to be when it gets too crowded.
the last that we went was right after they opened the new Penguins exhibit - pretty cool. Those Steller's Sea Eagles are pretty amazing as well.