Predict final b.o.
Domestic: $240-280 million
Overseas: $450 million
Worldwide: $690-730 million
Looking at the numbers and release times of Moana and other films (it's going to be VERY crowded here soon in most of the big international and domestic market.)
My guess right now would be 225-250 million domestic. And world wide around 650-700 million. It's going to be a couple more weeks though before we can really get a good picture of what the large markets will do and how well Sing will be received. Not to mention Rouge One opens in many markets at the same time!