So I just had the thought thay we'll have three characters revesled at E3.
We'll have one revealed in the Digital Event.
We'll have another revealed as a "WARNING: CHALLENGER APPROACHING" at the end of the Smash tournament. Sakurai may come in to play as the new challenger against the champion.
Finally, Sakurai will reveal a third character at the end of his discussion.
I think something like this could happen. At the very least with so much Smash happening on June 10th I don't think we'll see only one newcomer.