Well, the sub 50k in the US for May (Inc Splatoon launch week) and 20k a week in Japan for the past 2 week isn't a big enough boost to take it over the 10m mark in time for E3 I don't think.
Either way, I'd love to know what the boost in Europe has been. I mean Splatoon charted nicely in 2nd in the UK (one of Nintendos weakest EU territories) and held onto 5th in Week 2.