By the end of the year, I think 10m WW.
[NA] 4.5m
[EU/AU] 2.75m
[Japan] 2.5m
[WW] 10m
I'm super hyped for this Smash, more than I ever have been before (and my hype was off the charts for both Brawl and SSB4, so that's saying something), so that may have factored into my prediction