Cheers darling I'll have to look into that
Edit: update 6/20 reread and still seeing nothing of 10% all that deej says is that it's a very small slice of Gameplay.
More likely 1% or around there.
Seeing as the D3 beta only showed to the Skeleton King, and that was the halfway point of act 1. With still an hour or 2 of act exploration left.
SO lets hope this is similar, seeing as we just barely have story elements, that most of them are being held out for release.