Hey calj,
I too am on the waitlist as an IS applicant. Although I am speculating here, I would imagine there being more waitlist movement in the coming week, considering the national deadline for students to submit their money deposit is on May 15. They (adcoms) always tell you that "waitlist movement varies from year to year and can occur up until the first day of class...sometimes even after in very rare cases."
Out of curiosity, about how many of your friends have been accepted off of the waitlist?