$224 million is the current WW total...I don't think $275-300 million will warrant a sequel..unless the bluray does really well.
I think it ends up with $95-105 million domestic and $240-290 overseas. I think $375-400 million WW will be enough for them to consider doing a sequel. The movie will still be a big money loser based on box office receipts though.
A $100-120 take for Japan and China combined would go a long way to proving any value as a franchise as it was tailored to those fanbases. It has performed well in Asia so far so that is entirely within the realm of possibility.