My daughter asked that exact question at the beginning of the tryouts and the coach said that they weren't allowed to disclose that information. Based on last year, 10-12 girls were invited to a team practice and the generic "rejection" notice went out on Friday afternoon (of the same week as the Monday tryouts). Hope that helps - good luck!
One of the girls on my daughter's 2012 team already got a call back to attend a team practice this week. They usually reach out to the top contenders within 2-3 days of the tryout.