I assume that audition winners already know they won unless UF plans to do another Fukuchan-type of surprise.
It's probably really hard for a Kenshuusei to hide the fact that they won. I mean, even though Haruka had prior commitments, even the other Eggs members knew that she was a finalist and has a chance to join Morning Musume. This time around, I don't think any kenshuusei members know which of them was a finalist (that is if any of them were a finalist). They probably had training camp around the time Kenshuusei had a break from their rehersal.